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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 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Loans with a specific valuation allowance [Abstract]          
Specific Allowance $ 1,149 $ 1,348 $ 1,149 $ 1,348 $ 2,461
Total impaired loans [Abstract]          
Recorded balance 55,045 48,339 55,045 48,339 49,888
Unpaid Contractual Principal Balance 58,743 51,635 58,743 51,635 53,243
Specific Allowance 1,149 1,348 1,149 1,348 2,461
Average Investment in Impaired Loans 55,572 49,134 56,646 52,515 51,976
Interest Income Recognized [1] 622 450 1,866 1,391 1,952
Commercial [Member] | Construction [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 4,270 4,669 4,270 4,669 2,861
Unpaid Contractual Principal Balance 4,293 4,669 4,293 4,669 2,862
Average Investment in Impaired Loans 4,299 4,864 4,450 5,142 4,574
Interest Income Recognized [1] 63 41 168 160 200
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 1,668 3,411 1,668 3,411 3,402
Unpaid Contractual Principal Balance 1,670 3,412 1,670 3,412 3,402
Specific Allowance 212 719 212 719 831
Average Investment in Impaired Loans 1,798 3,445 2,524 3,712 3,631
Interest Income Recognized [1] 0 0 0 0 0
Total impaired loans [Abstract]          
Recorded balance 5,938 8,080 5,938 8,080 6,263
Unpaid Contractual Principal Balance 5,963 8,081 5,963 8,081 6,264
Specific Allowance 212 719 212 719 831
Average Investment in Impaired Loans 6,097 8,309 6,974 8,854 8,205
Interest Income Recognized [1] 63 41 168 160 200
Commercial [Member] | Real Estate [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 32,311 30,318 32,311 30,318 30,761
Unpaid Contractual Principal Balance 33,004 31,551 33,004 31,551 32,166
Average Investment in Impaired Loans 32,534 30,713 31,795 30,357 30,605
Interest Income Recognized [1] 390 316 1,164 985 1,378
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 3,537 835 3,537 835 2,660
Unpaid Contractual Principal Balance 4,688 1,075 4,688 1,075 2,768
Specific Allowance 747 317 747 317 1,227
Average Investment in Impaired Loans 3,547 841 3,957 2,244 2,349
Interest Income Recognized [1] 1 6 19 7 7
Total impaired loans [Abstract]          
Recorded balance 35,848 31,153 35,848 31,153 33,421
Unpaid Contractual Principal Balance 37,692 32,626 37,692 32,626 34,934
Specific Allowance 747 317 747 317 1,227
Average Investment in Impaired Loans 36,081 31,554 35,752 32,601 32,954
Interest Income Recognized [1] 391 322 1,183 992 1,385
Commercial [Member] | Other [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 11,382 7,163 11,382 7,163 7,500
Unpaid Contractual Principal Balance 13,191 8,804 13,191 8,804 9,148
Average Investment in Impaired Loans 11,497 7,312 11,564 9,182 8,802
Interest Income Recognized [1] 153 73 470 201 316
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 388 754 388 754 960
Unpaid Contractual Principal Balance 408 935 408 935 1,153
Specific Allowance 190 312 190 312 403
Average Investment in Impaired Loans 405 776 597 788 836
Interest Income Recognized [1] 0 1 0 1 1
Total impaired loans [Abstract]          
Recorded balance 11,770 7,917 11,770 7,917 8,460
Unpaid Contractual Principal Balance 13,599 9,739 13,599 9,739 10,301
Specific Allowance 190 312 190 312 403
Average Investment in Impaired Loans 11,902 8,088 12,161 9,970 9,638
Interest Income Recognized [1] 153 74 470 202 317
Residential [Member] | Real Estate [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 1,489 1,189 1,489 1,189 1,744
Unpaid Contractual Principal Balance 1,489 1,189 1,489 1,189 1,744
Average Investment in Impaired Loans 1,492 1,183 1,759 1,090 1,179
Interest Income Recognized [1] 15 13 45 37 50
Loans with a specific valuation allowance [Abstract]          
Specific Allowance 0 0 0 0 0
Total impaired loans [Abstract]          
Recorded balance 1,489 1,189 1,489 1,189 1,744
Unpaid Contractual Principal Balance 1,489 1,189 1,489 1,189 1,744
Specific Allowance 0 0 0 0 0
Average Investment in Impaired Loans 1,492 1,183 1,759 1,090 1,179
Interest Income Recognized [1] $ 15 $ 13 $ 45 $ 37 $ 50
[1] Cash basis interest is substantially the same as interest income recognized.