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Loan Portfolio and Credit Quality Impaired Loans With and Without Related Allowance (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] $ 19,302 $ 24,017 $ 14,594
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 10,009 12,925 11,436
Impaired Financing Receivable, Recorded Investment [1] 29,311 36,942 26,030
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 25,421 36,096 20,815
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 10,438 13,354 11,865
Impaired Financing Receivable, Unpaid Principal Balance 35,859 49,450 32,680
Impaired Financing Receivable, Related Allowance 1,013 1,167 1,135
Impaired Financing Receivable, Related Allowance 1,013 1,167 1,135
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 17,882 22,740 22,323
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 11,027 15,187 13,276
Impaired Financing Receivable, Average Recorded Investment 28,909 37,927 35,599
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 360 107 1,540
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 114 124 458
Impaired Financing Receivable, Interest Income, Cash Basis Method 474 231 1,998
Commercial and industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 1,670 2,446 1,793
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 0 48 0
Impaired Financing Receivable, Recorded Investment [1] 1,670 2,494 1,793
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 2,045 4,431 2,155
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 48 0
Impaired Financing Receivable, Unpaid Principal Balance 2,045 4,479 2,155
Impaired Financing Receivable, Related Allowance 0 23 0
Impaired Financing Receivable, Related Allowance 0 23 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 1,731 2,132 5,288
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 22 31
Impaired Financing Receivable, Average Recorded Investment 1,731 2,154 5,319
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 13 12 249
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 0 1 1
Impaired Financing Receivable, Interest Income, Cash Basis Method 13 13 250
Commercial Tax Exempt [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 4,337 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 0 0 0
Impaired Financing Receivable, Recorded Investment [1] 4,337 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 4,337 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Unpaid Principal Balance 4,337 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 3,253 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, Average Recorded Investment 3,253 0 0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 0 0 0
Impaired Financing Receivable, Interest Income, Cash Basis Method 0 0 0
Commercial real estate [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 3,747 11,900 4,488
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 7,041 7,299 7,115
Impaired Financing Receivable, Recorded Investment [1] 10,788 19,199 11,603
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 8,787 20,038 9,647
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 7,470 7,728 7,544
Impaired Financing Receivable, Unpaid Principal Balance 16,257 27,766 17,191
Impaired Financing Receivable, Related Allowance 475 671 548
Impaired Financing Receivable, Related Allowance 475 671 548
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 4,269 12,017 8,520
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 7,073 7,323 7,230
Impaired Financing Receivable, Average Recorded Investment 11,342 19,340 15,750
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 246 38 1,032
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 75 80 314
Impaired Financing Receivable, Interest Income, Cash Basis Method 321 118 1,346
Construction and land [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 147 2,850 179
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 0 0 0
Impaired Financing Receivable, Recorded Investment [1] 147 2,850 179
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 479 4,446 507
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Unpaid Principal Balance 479 4,446 507
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 164 1,520 1,069
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 1,650 507
Impaired Financing Receivable, Average Recorded Investment 164 3,170 1,576
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 0 0 48
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 0 0 0
Impaired Financing Receivable, Interest Income, Cash Basis Method 0 0 48
Residential [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 9,401 6,821 8,134
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 2,931 5,578 4,284
Impaired Financing Receivable, Recorded Investment [1] 12,332 12,399 12,418
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 9,773 7,181 8,506
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 2,931 5,578 4,284
Impaired Financing Receivable, Unpaid Principal Balance 12,704 12,759 12,790
Impaired Financing Receivable, Related Allowance 517 473 565
Impaired Financing Receivable, Related Allowance 517 473 565
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 8,465 7,071 7,446
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 3,917 6,192 5,505
Impaired Financing Receivable, Average Recorded Investment 12,382 13,263 12,951
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 101 57 211
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 39 43 143
Impaired Financing Receivable, Interest Income, Cash Basis Method 140 100 354
Home equity [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 0 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 37 0 37
Impaired Financing Receivable, Recorded Investment [1] 37 0 37
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 37 0 37
Impaired Financing Receivable, Unpaid Principal Balance 37 0 37
Impaired Financing Receivable, Related Allowance 21 0 22
Impaired Financing Receivable, Related Allowance 21 0 22
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 37 0 3
Impaired Financing Receivable, Average Recorded Investment 37 0 3
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 0 0 0
Impaired Financing Receivable, Interest Income, Cash Basis Method 0 0 0
Consumer and other [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 0 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] 0 0 0
Impaired Financing Receivable, Recorded Investment [1] 0 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method 0 0 0
Impaired Financing Receivable, Interest Income, Cash Basis Method $ 0 $ 0 $ 0
[1] Recorded investment represents the client loan balance net of historical charge-offs and historical nonaccrual interest paid, which was applied to principal.