Individually Impaired Loans by Class of Loans (Detail) - USD ($)
$ in Thousands |
Sep. 30, 2016 |
Jun. 30, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Dec. 31, 2014 |
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
|
| Individually evaluated for impairment, Loan balance |
|
$ 8,514
|
|
$ 10,639
|
|
|
|
| Individually evaluated for impairment, Loan allowance |
|
165
|
|
393
|
|
|
|
| Collectively evaluated for impairment, Loan balance |
|
1,780,903
|
|
1,526,550
|
|
|
|
| Collectively evaluated for impairment, Loan allowance |
|
12,804
|
|
10,847
|
|
|
|
| Total Loan balance |
|
1,789,417
|
|
1,537,189
|
|
|
|
| Total Loan, allowance |
|
12,969
|
$ 12,543
|
11,240
|
$ 10,390
|
$ 9,537
|
$ 8,881
|
| Mortgage Loan Portfolio Segment |
|
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
|
| Total Loan balance |
|
1,657,805
|
|
1,379,579
|
|
|
|
| Mortgage Loan Portfolio Segment | Real Estate Loan | Residential one-to-four family |
|
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
|
| Individually evaluated for impairment, Loan balance |
|
4,851
|
|
4,341
|
|
|
|
| Individually evaluated for impairment, Loan allowance |
|
163
|
|
260
|
|
|
|
| Collectively evaluated for impairment, Loan balance |
|
942,816
|
|
705,085
|
|
|
|
| Collectively evaluated for impairment, Loan allowance |
|
4,431
|
|
3,314
|
|
|
|
| Total Loan balance |
|
947,667
|
|
709,426
|
|
|
|
| Total Loan, allowance |
|
4,594
|
4,155
|
3,574
|
3,303
|
2,740
|
2,364
|
| Mortgage Loan Portfolio Segment | Real Estate Loan | Commercial real estate loans |
|
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
|
| Individually evaluated for impairment, Loan balance |
|
3,456
|
|
6,083
|
|
|
|
| Individually evaluated for impairment, Loan allowance |
|
2
|
|
133
|
|
|
|
| Collectively evaluated for impairment, Loan balance |
|
459,144
|
|
443,308
|
|
|
|
| Collectively evaluated for impairment, Loan allowance |
|
4,637
|
|
4,345
|
|
|
|
| Total Loan balance |
[1] |
462,600
|
|
449,391
|
|
|
|
| Total Loan, allowance |
|
4,639
|
4,810
|
4,478
|
4,136
|
4,122
|
4,043
|
| Mortgage Loan Portfolio Segment | Construction loans |
|
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
|
| Collectively evaluated for impairment, Loan balance |
|
76,681
|
|
60,722
|
|
|
|
| Collectively evaluated for impairment, Loan allowance |
|
1,051
|
|
801
|
|
|
|
| Total Loan balance |
|
76,681
|
|
60,722
|
|
|
|
| Total Loan, allowance |
|
1,051
|
864
|
801
|
833
|
585
|
228
|
| Mortgage Loan Portfolio Segment | Home equity lines of credit |
|
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
|
| Individually evaluated for impairment, Loan balance |
|
200
|
|
200
|
|
|
|
| Collectively evaluated for impairment, Loan balance |
|
170,657
|
|
159,840
|
|
|
|
| Collectively evaluated for impairment, Loan allowance |
|
1,041
|
|
928
|
|
|
|
| Total Loan balance |
|
170,857
|
|
160,040
|
|
|
|
| Total Loan, allowance |
|
1,041
|
1,038
|
928
|
830
|
827
|
828
|
| Commercial Portfolio Segment |
|
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
|
| Collectively evaluated for impairment, Loan balance |
|
61,314
|
|
53,192
|
|
|
|
| Collectively evaluated for impairment, Loan allowance |
|
710
|
|
613
|
|
|
|
| Total Loan balance |
|
61,314
|
|
53,192
|
|
|
|
| Total Loan, allowance |
|
710
|
698
|
613
|
423
|
355
|
458
|
| Consumer Portfolio Segment | Indirect auto loans |
|
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
|
| Individually evaluated for impairment, Loan balance |
|
7
|
|
15
|
|
|
|
| Collectively evaluated for impairment, Loan balance |
|
69,858
|
|
103,950
|
|
|
|
| Collectively evaluated for impairment, Loan allowance |
|
433
|
|
623
|
|
|
|
| Total Loan balance |
|
69,865
|
|
103,965
|
|
|
|
| Total Loan, allowance |
|
433
|
492
|
623
|
652
|
713
|
778
|
| Consumer Portfolio Segment | Other Consumer Loan |
|
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
|
| Collectively evaluated for impairment, Loan balance |
|
433
|
|
453
|
|
|
|
| Collectively evaluated for impairment, Loan allowance |
|
9
|
|
10
|
|
|
|
| Total Loan balance |
|
433
|
|
453
|
|
|
|
| Total Loan, allowance |
|
9
|
10
|
10
|
13
|
12
|
11
|
| Unallocated |
|
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
|
| Collectively evaluated for impairment, Loan allowance |
|
492
|
|
213
|
|
|
|
| Total Loan, allowance |
|
$ 492
|
$ 476
|
$ 213
|
$ 200
|
$ 183
|
$ 171
|
|
|