|
Loans and reserve for credit losses (Impaired Financing Receivables) (Details) (USD $)
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Dec. 31, 2014
|
Dec. 31, 2013
|
| Financing Receivable, Impaired [Line Items] |
|
|
| Impaired loans with specific valuation allowances |
$ 4,225,000 |
$ 8,887,000 |
| Impaired loans, Without a related allowance |
29,497,000 |
31,580,000 |
| Impaired loans, total recorded balance |
33,722,000 |
40,467,000 |
| Impaired loans, Unpaid principal balance |
36,920,000 |
44,856,000 |
| Impaired loans, Related allowance |
85,000 |
783,000 |
| Commercial Real Estate Owner Occupied |
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
| Impaired loans with specific valuation allowances |
436,000 |
2,772,000 |
| Impaired loans, Without a related allowance |
5,624,000 |
6,582,000 |
| Impaired loans, total recorded balance |
6,060,000 |
9,354,000 |
| Impaired loans, Unpaid principal balance |
8,699,000 |
12,707,000 |
| Impaired loans, Related allowance |
41,000 |
652,000 |
| Commercial Real Estate Non Owner Occupied |
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
| Impaired loans with specific valuation allowances |
1,087,000 |
1,116,000 |
| Impaired loans, Without a related allowance |
21,800,000 |
21,757,000 |
| Impaired loans, total recorded balance |
22,887,000 |
22,873,000 |
| Impaired loans, Unpaid principal balance |
22,943,000 |
22,904,000 |
| Impaired loans, Related allowance |
19,000 |
13,000 |
| Commercial real estate |
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
| Impaired loans with specific valuation allowances |
1,523,000 |
3,888,000 |
| Impaired loans, Without a related allowance |
27,424,000 |
28,339,000 |
| Impaired loans, total recorded balance |
28,947,000 |
32,227,000 |
| Impaired loans, Unpaid principal balance |
31,642,000 |
35,611,000 |
| Impaired loans, Related allowance |
60,000 |
665,000 |
| Construction |
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
| Impaired loans with specific valuation allowances |
0 |
751,000 |
| Impaired loans, Without a related allowance |
963,000 |
1,236,000 |
| Impaired loans, total recorded balance |
963,000 |
1,987,000 |
| Impaired loans, Unpaid principal balance |
963,000 |
2,029,000 |
| Impaired loans, Related allowance |
0 |
0 |
| Residential real estate |
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
| Impaired loans with specific valuation allowances |
0 |
174,000 |
| Impaired loans, Without a related allowance |
317,000 |
256,000 |
| Impaired loans, total recorded balance |
317,000 |
430,000 |
| Impaired loans, Unpaid principal balance |
353,000 |
515,000 |
| Impaired loans, Related allowance |
0 |
62,000 |
| Commercial and industrial |
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
| Impaired loans with specific valuation allowances |
2,702,000 |
4,074,000 |
| Impaired loans, Without a related allowance |
793,000 |
1,749,000 |
| Impaired loans, total recorded balance |
3,495,000 |
5,823,000 |
| Impaired loans, Unpaid principal balance |
3,962,000 |
6,701,000 |
| Impaired loans, Related allowance |
25,000 |
56,000 |
| Consumer |
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
| Impaired loans with specific valuation allowances |
0 |
0 |
| Impaired loans, Without a related allowance |
0 |
0 |
| Impaired loans, total recorded balance |
0 |
0 |
| Impaired loans, Unpaid principal balance |
0 |
0 |
| Impaired loans, Related allowance |
$ 0 |
$ 0 |