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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.