Fair Value Measurement - Schedule of Fair Value of Assets and Liabilities Measured on Recurring and Nonrecurring Basis (Detail) - USD ($)
$ in Thousands |
Mar. 31, 2018 |
Dec. 31, 2017 |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Equity securities |
$ 13,986
|
$ 13,457
|
| Total debt securities - available-for-sale |
1,728,377
|
1,261,865
|
| Loans held for sale |
12,962
|
20,320
|
| Other real estate owned and repossessed assets |
4,067
|
5,297
|
| Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Equity securities |
13,986
|
13,457
|
| Total debt securities - available-for-sale |
1,728,377
|
1,261,865
|
| Loans held for sale |
12,962
|
20,320
|
| Other assets - interest rate derivatives agreements |
9,257
|
7,351
|
| Total assets recurring fair value measurements |
1,764,582
|
1,302,993
|
| Nonrecurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Other liabilities - interest rate derivatives agreements |
9,083
|
7,345
|
| Total liabilities recurring fair value measurements |
9,083
|
7,345
|
| Impaired loans |
1,717
|
1,717
|
| Other real estate owned and repossessed assets |
4,067
|
5,297
|
| Total assets recurring fair value measurements |
5,784
|
7,014
|
| US Treasury Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
9,894
|
|
| US Treasury Securities [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
9,894
|
|
| U.S. Government Sponsored Entities and Agencies [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
96,458
|
71,843
|
| U.S. Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
96,458
|
71,843
|
| Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
1,344,410
|
934,922
|
| Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
1,344,410
|
934,922
|
| Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
140,926
|
114,867
|
| Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
140,926
|
114,867
|
| Obligations of State and Political Subdivisions [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
101,431
|
104,830
|
| Obligations of State and Political Subdivisions [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
101,431
|
104,830
|
| Corporate Debt Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
35,258
|
35,403
|
| Corporate Debt Securities [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
35,258
|
35,403
|
| Investments Measured at Net Asset Value [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Equity securities |
2,418
|
2,066
|
| Investments Measured at Net Asset Value [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Equity securities |
2,418
|
2,066
|
| Total assets recurring fair value measurements |
2,418
|
2,066
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Equity securities |
11,568
|
11,391
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Equity securities |
11,568
|
11,391
|
| Total assets recurring fair value measurements |
11,568
|
11,391
|
| Significant Other Observable Inputs (Level 2) [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Other liabilities - interest rate derivatives agreements |
9,083
|
7,345
|
| Total debt securities - available-for-sale |
1,728,377
|
1,261,865
|
| Loans held for sale |
12,962
|
20,320
|
| Other assets - interest rate derivatives agreements |
9,257
|
7,351
|
| Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
1,728,377
|
1,261,865
|
| Loans held for sale |
12,962
|
20,320
|
| Other assets - interest rate derivatives agreements |
9,257
|
7,351
|
| Total assets recurring fair value measurements |
1,750,596
|
1,289,536
|
| Significant Other Observable Inputs (Level 2) [Member] | Nonrecurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Other liabilities - interest rate derivatives agreements |
9,083
|
7,345
|
| Total liabilities recurring fair value measurements |
9,083
|
7,345
|
| Significant Other Observable Inputs (Level 2) [Member] | US Treasury Securities [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
9,894
|
|
| Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
96,458
|
71,843
|
| Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
1,344,410
|
934,922
|
| Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
140,926
|
114,867
|
| Significant Other Observable Inputs (Level 2) [Member] | Obligations of State and Political Subdivisions [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
101,431
|
104,830
|
| Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member] | Recurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total debt securities - available-for-sale |
35,258
|
35,403
|
| Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring Fair Value Measurements [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Impaired loans |
1,717
|
1,717
|
| Other real estate owned and repossessed assets |
4,067
|
5,297
|
| Total assets recurring fair value measurements |
$ 5,784
|
$ 7,014
|