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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Loans with a specific valuation allowance [Abstract]          
Specific Allowance $ 1,319 $ 1,337 $ 1,319 $ 1,337 $ 1,313
Total impaired loans [Abstract]          
Recorded balance 50,729 53,269 50,729 53,269 52,202
Unpaid Contractual Principal Balance 54,443 57,044 54,443 57,044 55,888
Specific Allowance 1,319 1,337 1,319 1,337 1,313
Average Investment in Impaired Loans 51,594 54,916 51,214 57,185 55,679
Interest Income Recognized [1] 541 626 1,090 1,244 2,530
Commercial [Member] | Construction [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 4,707 4,455 4,707 4,455 4,102
Unpaid Contractual Principal Balance 4,709 4,741 4,709 4,741 4,123
Average Investment in Impaired Loans 5,041 4,730 5,101 4,526 4,367
Interest Income Recognized [1] 49 56 86 105 218
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 153 2,207 153 2,207 1,507
Unpaid Contractual Principal Balance 174 2,209 174 2,209 1,509
Specific Allowance 25 287 25 287 213
Average Investment in Impaired Loans 153 2,372 157 2,887 2,290
Interest Income Recognized [1] 0 0 0 0 0
Total impaired loans [Abstract]          
Recorded balance 4,860 6,662 4,860 6,662 5,609
Unpaid Contractual Principal Balance 4,883 6,950 4,883 6,950 5,632
Specific Allowance 25 287 25 287 213
Average Investment in Impaired Loans 5,194 7,102 5,258 7,413 6,657
Interest Income Recognized [1] 49 56 86 105 218
Commercial [Member] | Real Estate [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 27,509 30,181 27,509 30,181 29,025
Unpaid Contractual Principal Balance 28,195 30,816 28,195 30,816 29,594
Average Investment in Impaired Loans 27,858 30,339 28,252 31,426 31,136
Interest Income Recognized [1] 343 387 704 774 1,609
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 4,731 2,667 4,731 2,667 4,731
Unpaid Contractual Principal Balance 5,833 3,721 5,833 3,721 5,885
Specific Allowance 1,227 720 1,227 720 1,035
Average Investment in Impaired Loans 4,745 3,598 4,362 4,163 4,151
Interest Income Recognized [1] 5 0 5 18 19
Total impaired loans [Abstract]          
Recorded balance 32,240 32,848 32,240 32,848 33,756
Unpaid Contractual Principal Balance 34,028 34,537 34,028 34,537 35,479
Specific Allowance 1,227 720 1,227 720 1,035
Average Investment in Impaired Loans 32,603 33,937 32,614 35,589 35,287
Interest Income Recognized [1] 348 387 709 792 1,628
Commercial [Member] | Equipment Lease Financing [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 130   130    
Unpaid Contractual Principal Balance 130   130    
Average Investment in Impaired Loans 135   68    
Interest Income Recognized [1] 0   0    
Loans with a specific valuation allowance [Abstract]          
Specific Allowance 0   0    
Total impaired loans [Abstract]          
Recorded balance 130   130    
Unpaid Contractual Principal Balance 130   130    
Specific Allowance 0   0    
Average Investment in Impaired Loans 135   68    
Interest Income Recognized [1] 0   0    
Commercial [Member] | Other [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 10,719 11,328 10,719 11,328 11,215
Unpaid Contractual Principal Balance 12,619 13,113 12,619 13,113 13,155
Average Investment in Impaired Loans 10,882 11,446 10,981 11,597 11,561
Interest Income Recognized [1] 133 169 273 317 632
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 131 670 131 670 139
Unpaid Contractual Principal Balance 134 683 134 683 139
Specific Allowance 67 330 67 330 65
Average Investment in Impaired Loans 131 667 66 693 483
Interest Income Recognized [1] 0 0 0 0 0
Total impaired loans [Abstract]          
Recorded balance 10,850 11,998 10,850 11,998 11,354
Unpaid Contractual Principal Balance 12,753 13,796 12,753 13,796 13,294
Specific Allowance 67 330 67 330 65
Average Investment in Impaired Loans 11,013 12,113 11,047 12,290 12,044
Interest Income Recognized [1] 133 169 273 317 632
Residential [Member] | Construction [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 846   846    
Unpaid Contractual Principal Balance 846   846    
Average Investment in Impaired Loans 846   423    
Interest Income Recognized [1] 0   0    
Loans with a specific valuation allowance [Abstract]          
Specific Allowance 0   0    
Total impaired loans [Abstract]          
Recorded balance 846   846    
Unpaid Contractual Principal Balance 846   846    
Specific Allowance 0   0    
Average Investment in Impaired Loans 846   423    
Interest Income Recognized [1] 0   0    
Residential [Member] | Real Estate [Member]          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 1,803 1,761 1,803 1,761 1,483
Unpaid Contractual Principal Balance 1,803 1,761 1,803 1,761 1,483
Average Investment in Impaired Loans 1,803 1,764 1,804 1,893 1,691
Interest Income Recognized [1] 11 14 22 30 52
Loans with a specific valuation allowance [Abstract]          
Specific Allowance 0 0 0 0 0
Total impaired loans [Abstract]          
Recorded balance 1,803 1,761 1,803 1,761 1,483
Unpaid Contractual Principal Balance 1,803 1,761 1,803 1,761 1,483
Specific Allowance 0 0 0 0 0
Average Investment in Impaired Loans 1,803 1,764 1,804 1,893 1,691
Interest Income Recognized [1] $ 11 $ 14 $ 22 $ 30 $ 52
[1] Cash basis interest is substantially the same as interest income recognized.