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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 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Loans with a specific valuation allowance [Abstract]          
Specific Allowance $ 1,337 $ 1,463 $ 1,337 $ 1,463 $ 2,461
Total impaired loans [Abstract]          
Recorded balance 53,269 50,173 53,269 50,173 49,888
Unpaid Contractual Principal Balance 57,044 53,503 57,044 53,503 53,243
Specific Allowance 1,337 1,463 1,337 1,463 2,461
Average Investment in Impaired Loans 54,916 51,162 57,185 54,209 51,976
Interest Income Recognized [1] 626 506 1,244 941 1,952
Commercial [Member] | Construction [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 4,455 5,211 4,455 5,211 2,861
Unpaid Contractual Principal Balance 4,741 5,211 4,741 5,211 2,862
Average Investment in Impaired Loans 4,730 5,266 4,526 5,282 4,574
Interest Income Recognized [1] 56 68 105 119 200
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 2,207 3,500 2,207 3,500 3,402
Unpaid Contractual Principal Balance 2,209 3,500 2,209 3,500 3,402
Specific Allowance 287 719 287 719 831
Average Investment in Impaired Loans 2,372 3,796 2,887 3,846 3,631
Interest Income Recognized [1] 0 0 0 0 0
Total impaired loans [Abstract]          
Recorded balance 6,662 8,711 6,662 8,711 6,263
Unpaid Contractual Principal Balance 6,950 8,711 6,950 8,711 6,264
Specific Allowance 287 719 287 719 831
Average Investment in Impaired Loans 7,102 9,062 7,413 9,128 8,205
Interest Income Recognized [1] 56 68 105 119 200
Commercial [Member] | Real Estate [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 30,181 29,951 30,181 29,951 30,761
Unpaid Contractual Principal Balance 30,816 31,340 30,816 31,340 32,166
Average Investment in Impaired Loans 30,339 30,366 31,426 30,179 30,605
Interest Income Recognized [1] 387 359 774 669 1,378
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 2,667 2,377 2,667 2,377 2,660
Unpaid Contractual Principal Balance 3,721 2,560 3,721 2,560 2,768
Specific Allowance 720 529 720 529 1,227
Average Investment in Impaired Loans 3,598 2,452 4,163 2,946 2,349
Interest Income Recognized [1] 0 0 18 1 7
Total impaired loans [Abstract]          
Recorded balance 32,848 32,328 32,848 32,328 33,421
Unpaid Contractual Principal Balance 34,537 33,900 34,537 33,900 34,934
Specific Allowance 720 529 720 529 1,227
Average Investment in Impaired Loans 33,937 32,818 35,589 33,125 32,954
Interest Income Recognized [1] 387 359 792 670 1,385
Commercial [Member] | Other [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 11,328 7,262 11,328 7,262 7,500
Unpaid Contractual Principal Balance 13,113 8,898 13,113 8,898 9,148
Average Investment in Impaired Loans 11,446 7,367 11,597 10,118 8,802
Interest Income Recognized [1] 169 67 317 128 316
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 670 687 670 687 960
Unpaid Contractual Principal Balance 683 809 683 809 1,153
Specific Allowance 330 215 330 215 403
Average Investment in Impaired Loans 667 729 693 794 836
Interest Income Recognized [1] 0 0 0 0 1
Total impaired loans [Abstract]          
Recorded balance 11,998 7,949 11,998 7,949 8,460
Unpaid Contractual Principal Balance 13,796 9,707 13,796 9,707 10,301
Specific Allowance 330 215 330 215 403
Average Investment in Impaired Loans 12,113 8,096 12,290 10,912 9,638
Interest Income Recognized [1] 169 67 317 128 317
Residential [Member] | Real Estate [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 1,761 1,185 1,761 1,185 1,744
Unpaid Contractual Principal Balance 1,761 1,185 1,761 1,185 1,744
Average Investment in Impaired Loans 1,764 1,186 1,893 1,044 1,179
Interest Income Recognized [1] 14 12 30 24 50
Loans with a specific valuation allowance [Abstract]          
Specific Allowance 0 0 0 0 0
Total impaired loans [Abstract]          
Recorded balance 1,761 1,185 1,761 1,185 1,744
Unpaid Contractual Principal Balance 1,761 1,185 1,761 1,185 1,744
Specific Allowance 0 0 0 0 0
Average Investment in Impaired Loans 1,764 1,186 1,893 1,044 1,179
Interest Income Recognized [1] $ 14 $ 12 $ 30 $ 24 $ 50
[1] Cash basis interest is substantially the same as interest income recognized.