|
Investment securities (Investments Classified by Contractual Maturity Date) (Details) (USD $)
In Thousands, unless otherwise specified
|
Dec. 31, 2014
|
Dec. 31, 2013
|
| Available-for-sale |
|
|
| Available-for-sale, Amortized cost, Due in one year or less |
$ 377 |
|
| Available-for-sale, Amortized cost, Due after one year through five years |
13,883 |
|
| Available-for-sale, Amortized cost, Due after five years through ten years |
71,304 |
|
| Available-for-sale, Amortized cost, Due after ten years |
229,347 |
|
| Available-for-sale, Amortized cost, Mutual fund |
514 |
|
| Available-for-sale, Amortized cost, Tax credit investments |
0 |
|
| Available-for-sale Securities, Debt Maturities, Amortized Cost Basis |
315,425 |
|
| Available-for-sale, Estimated fair value, Due in one year or less |
379 |
|
| Available-for-sale, Estimated fair value, Due after one year through five years |
13,914 |
|
| Available-for-sale, Estimated fair value, Due after five years through ten years |
70,826 |
|
| Available-for-sale, Estimated fair value, Due after ten years |
234,236 |
|
| Available-for-sale, Estimated fair value, Mutual fund |
527 |
|
| Available-for-sale, Estimated fair value, Tax credit investments |
0 |
|
| Available-for-sale Securities, Debt Securities |
319,882 |
|
| Held-to-maturity |
|
|
| Held-to-maturity Securities, Amortized cost, Due in one year or less |
195 |
|
| Held-to-maturity Securities, Amortized cost, Due after one year through five years |
19,331 |
|
| Held-to-maturity Securities, Amortized cost, Due after five years through ten years |
102,002 |
|
| Held-to-maturity Securities, Amortized cost, Due after ten years |
30,487 |
|
| Held-to-maturity Securities, Amortized cost, Mutual fund |
0 |
|
| Held-to-maturity Securities, Amortized cost, Tax credit investments |
564 |
|
| Held-to-maturity Securities, Debt Maturities, Net Carrying Amount |
152,579 |
1,320 |
| Held-to-maturity Securities, Estimated fair value, Due in one year or less |
201 |
|
| Held-to-maturity Securities, Estimated fair value, Due after one year through five years |
19,377 |
|
| Held-to-maturity Securities, Estimated fair value, Due after five years through ten years |
104,190 |
|
| Held-to-maturity Securities, Estimated fair value, Due after ten years |
31,223 |
|
| Held-to-maturity Securities, Estimated fair value, Mutual fund |
0 |
|
| Held-to-maturity Securities Estimated fair value, Tax credit investments |
564 |
|
| Held-to-maturity Securities, Debt Maturities, Fair Value |
$ 155,555 |
$ 1,342 |