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Loans, Impaired Loans, Average Investments in Impaired Loans, and Interest Income Recognized on Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans with a specific valuation allowance [Abstract]      
Specific Allowance $ 1,313 $ 2,461 $ 1,742
Total impaired loans [Abstract]      
Recorded Balance 52,202 49,888 59,068
Unpaid Contractual Principal Balance 55,888 53,243 62,508
Specific Allowance 1,313 2,461 1,742
Average Investment in Impaired Loans 55,679 51,976 66,358
Interest Income Recognized [1] 2,530 1,952 2,233
Commercial [Member] | Construction [Member]      
Loans without a specific valuation allowance [Abstract]      
Recorded Balance 4,102 2,861 5,653
Unpaid Contractual Principal Balance 4,123 2,862 5,654
Average Investment in Impaired Loans 4,367 4,574 5,415
Interest Income Recognized [1] 218 200 205
Loans with a specific valuation allowance [Abstract]      
Recorded Balance 1,507 3,402 3,974
Unpaid Contractual Principal Balance 1,509 3,402 3,974
Specific Allowance 213 831 734
Average Investment in Impaired Loans 2,290 3,631 4,216
Interest Income Recognized [1] 0 0 0
Total impaired loans [Abstract]      
Recorded Balance 5,609 6,263 9,627
Unpaid Contractual Principal Balance 5,632 6,264 9,628
Specific Allowance 213 831 734
Average Investment in Impaired Loans 6,657 8,205 9,631
Interest Income Recognized [1] 218 200 205
Commercial [Member] | Real Estate [Member]      
Loans without a specific valuation allowance [Abstract]      
Recorded Balance 29,025 30,761 31,639
Unpaid Contractual Principal Balance 29,594 32,166 33,268
Average Investment in Impaired Loans 31,136 30,605 34,650
Interest Income Recognized [1] 1,609 1,378 1,180
Loans with a specific valuation allowance [Abstract]      
Recorded Balance 4,731 2,660 2,718
Unpaid Contractual Principal Balance 5,885 2,768 2,876
Specific Allowance 1,035 1,227 827
Average Investment in Impaired Loans 4,151 2,349 4,376
Interest Income Recognized [1] 19 7 11
Total impaired loans [Abstract]      
Recorded Balance 33,756 33,421 34,357
Unpaid Contractual Principal Balance 35,479 34,934 36,144
Specific Allowance 1,035 1,227 827
Average Investment in Impaired Loans 35,287 32,954 39,026
Interest Income Recognized [1] 1,628 1,385 1,191
Commercial [Member] | Other [Member]      
Loans without a specific valuation allowance [Abstract]      
Recorded Balance 11,215 7,500 13,069
Unpaid Contractual Principal Balance 13,155 9,148 14,597
Average Investment in Impaired Loans 11,561 8,802 15,663
Interest Income Recognized [1] 632 316 783
Loans with a specific valuation allowance [Abstract]      
Recorded Balance 139 960 738
Unpaid Contractual Principal Balance 139 1,153 862
Specific Allowance 65 403 181
Average Investment in Impaired Loans 483 836 531
Interest Income Recognized [1] 0 1 1
Total impaired loans [Abstract]      
Recorded Balance 11,354 8,460 13,807
Unpaid Contractual Principal Balance 13,294 10,301 15,459
Specific Allowance 65 403 181
Average Investment in Impaired Loans 12,044 9,638 16,194
Interest Income Recognized [1] 632 317 784
Residential [Member] | Real Estate [Member]      
Loans without a specific valuation allowance [Abstract]      
Recorded Balance 1,483 1,744 1,277
Unpaid Contractual Principal Balance 1,483 1,744 1,277
Average Investment in Impaired Loans 1,691 1,179 1,507
Interest Income Recognized [1] 52 50 53
Loans with a specific valuation allowance [Abstract]      
Specific Allowance 0 0 0
Total impaired loans [Abstract]      
Recorded Balance 1,483 1,744 1,277
Unpaid Contractual Principal Balance 1,483 1,744 1,277
Specific Allowance 0 0 0
Average Investment in Impaired Loans 1,691 1,179 1,507
Interest Income Recognized [1] $ 52 $ 50 $ 53
[1] Cash basis interest is substantially the same as interest income recognized.