Allowance for Loan and Lease Losses - Loans Evaluated for Impairment (Details) - USD ($)
$ in Thousands |
Mar. 31, 2018 |
Dec. 31, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Ending balance |
$ 40,211
|
$ 39,771
|
|
|
| Originated |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Individually evaluated for impairment |
471
|
441
|
|
|
| Collectively evaluated for impairment |
39,636
|
39,245
|
|
|
| Ending balance |
40,107
|
39,686
|
$ 35,915
|
$ 35,598
|
| Originated | Commercial and industrial |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Individually evaluated for impairment |
446
|
441
|
|
|
| Collectively evaluated for impairment |
11,985
|
11,371
|
|
|
| Ending balance |
12,431
|
11,812
|
10,273
|
9,389
|
| Originated | Commercial real estate |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Individually evaluated for impairment |
25
|
0
|
|
|
| Collectively evaluated for impairment |
20,377
|
20,412
|
|
|
| Ending balance |
20,402
|
20,412
|
19,114
|
19,836
|
| Originated | Residential real estate |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Individually evaluated for impairment |
0
|
0
|
|
|
| Collectively evaluated for impairment |
5,972
|
6,161
|
|
|
| Ending balance |
5,972
|
6,161
|
5,386
|
5,149
|
| Originated | Consumer and other |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Individually evaluated for impairment |
0
|
0
|
|
|
| Collectively evaluated for impairment |
1,302
|
1,301
|
|
|
| Ending balance |
1,302
|
1,301
|
1,142
|
1,224
|
| Originated | Finance Leases |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Individually evaluated for impairment |
0
|
0
|
|
|
| Collectively evaluated for impairment |
0
|
0
|
|
|
| Ending balance |
0
|
0
|
0
|
0
|
| Acquired |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Individually evaluated for impairment |
25
|
25
|
|
|
| Collectively evaluated for impairment |
79
|
60
|
|
|
| Ending balance |
104
|
85
|
251
|
157
|
| Acquired | Commercial and industrial |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Individually evaluated for impairment |
25
|
25
|
|
|
| Collectively evaluated for impairment |
0
|
0
|
|
|
| Ending balance |
25
|
25
|
0
|
0
|
| Acquired | Commercial real estate |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Individually evaluated for impairment |
0
|
0
|
|
|
| Collectively evaluated for impairment |
0
|
0
|
|
|
| Ending balance |
0
|
0
|
76
|
97
|
| Acquired | Residential real estate |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Individually evaluated for impairment |
0
|
0
|
|
|
| Collectively evaluated for impairment |
73
|
54
|
|
|
| Ending balance |
73
|
54
|
169
|
54
|
| Acquired | Consumer and other |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Individually evaluated for impairment |
0
|
0
|
|
|
| Collectively evaluated for impairment |
6
|
6
|
|
|
| Ending balance |
6
|
6
|
6
|
6
|
| Acquired | Finance Leases |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Individually evaluated for impairment |
0
|
0
|
|
|
| Collectively evaluated for impairment |
0
|
0
|
|
|
| Ending balance |
$ 0
|
$ 0
|
$ 0
|
$ 0
|