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Loans, Impaired Loans, Average Investments in Impaired Loans, and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | $ 952 | $ 2,666 | $ 1,313
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 50,300 | 59,542 | 52,202
Unpaid Contractual Principal Balance |  | 53,798 | 62,300 | 55,888
Specific Allowance |  | 952 | 2,666 | 1,313
Average Investment in Impaired Loans |  | 50,828 | 59,449 | 55,679
Interest Income Recognized | [1] | 549 | 618 | 2,530
Commercial [Member] | Construction [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 4,966 | 4,219 | 4,102
Unpaid Contractual Principal Balance |  | 4,968 | 4,220 | 4,123
Average Investment in Impaired Loans |  | 5,161 | 4,322 | 4,367
Interest Income Recognized | [1] | 37 | 49 | 218
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 153 | 3,337 | 1,507
Unpaid Contractual Principal Balance |  | 174 | 3,339 | 1,509
Specific Allowance |  | 25 | 746 | 213
Average Investment in Impaired Loans |  | 161 | 3,401 | 2,290
Interest Income Recognized | [1] | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 5,119 | 7,556 | 5,609
Unpaid Contractual Principal Balance |  | 5,142 | 7,559 | 5,632
Specific Allowance |  | 25 | 746 | 213
Average Investment in Impaired Loans |  | 5,322 | 7,723 | 6,657
Interest Income Recognized | [1] | 37 | 49 | 218
Commercial [Member] | Real Estate [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 28,493 | 32,664 | 29,025
Unpaid Contractual Principal Balance |  | 28,956 | 33,474 | 29,594
Average Investment in Impaired Loans |  | 28,645 | 32,511 | 31,136
Interest Income Recognized | [1] | 361 | 387 | 1,609
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 3,959 | 4,753 | 4,731
Unpaid Contractual Principal Balance |  | 5,051 | 4,868 | 5,885
Specific Allowance |  | 927 | 1,588 | 1,035
Average Investment in Impaired Loans |  | 3,978 | 4,727 | 4,151
Interest Income Recognized | [1] | 0 | 18 | 19
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 32,452 | 37,417 | 33,756
Unpaid Contractual Principal Balance |  | 34,007 | 38,342 | 35,479
Specific Allowance |  | 927 | 1,588 | 1,035
Average Investment in Impaired Loans |  | 32,623 | 37,238 | 35,287
Interest Income Recognized | [1] | 361 | 405 | 1,628
Commercial [Member] | Other [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 10,927 | 11,838 | 11,215
Unpaid Contractual Principal Balance |  | 12,847 | 13,600 | 13,155
Average Investment in Impaired Loans |  | 11,079 | 11,748 | 11,561
Interest Income Recognized | [1] | 140 | 148 | 632
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 0 | 713 | 139
Unpaid Contractual Principal Balance |  | 0 | 781 | 139
Specific Allowance |  | 0 | 332 | 65
Average Investment in Impaired Loans |  | 0 | 719 | 483
Interest Income Recognized | [1] | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 10,927 | 12,551 | 11,354
Unpaid Contractual Principal Balance |  | 12,847 | 14,381 | 13,294
Specific Allowance |  | 0 | 332 | 65
Average Investment in Impaired Loans |  | 11,079 | 12,467 | 12,044
Interest Income Recognized | [1] | 140 | 148 | 632
Residential [Member] | Real Estate [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 1,802 | 2,018 | 1,483
Unpaid Contractual Principal Balance |  | 1,802 | 2,018 | 1,483
Average Investment in Impaired Loans |  | 1,804 | 2,021 | 1,691
Interest Income Recognized | [1] | 11 | 16 | 52
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded balance |  | 1,802 | 2,018 | 1,483
Unpaid Contractual Principal Balance |  | 1,802 | 2,018 | 1,483
Specific Allowance |  | 0 | 0 | 0
Average Investment in Impaired Loans |  | 1,804 | 2,021 | 1,691
Interest Income Recognized | [1] | $ 11 | $ 16 | $ 52
[1] | Cash basis interest is substantially the same as interest income recognized.

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