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Loans, Allowance for Loan Losses and Credit Quality (ALLL - by category) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Summary of changes in allowance for loan losses          
Beginning Balance $ 56,432 $ 54,515 $ 55,825 $ 55,100  
Charge-offs (577) (1,099) (1,114) (2,624)  
Recoveries 1,272 879 1,891 2,319  
Provision for loan losses 600 700 1,125 200  
Ending Balance 57,727 54,995 57,727 54,995  
Ending Balance: Individually Evaluated for Impairment 2,492 2,132 2,492 2,132 $ 1,930
Ending Balance: Collectively Evaluated for Impairment 55,235 52,863 55,235 52,863  
Commercial and Industrial [Member]          
Summary of changes in allowance for loan losses          
Beginning Balance 13,485 14,557 13,802 15,573  
Charge-offs (2) (473) (4) (1,034)  
Recoveries 649 502 787 881  
Provision for loan losses (105) 693 (558) (141)  
Ending Balance 14,027 15,279 14,027 15,279  
Ending Balance: Individually Evaluated for Impairment 255 310 255 310 183
Ending Balance: Collectively Evaluated for Impairment 13,772 14,969 13,772 14,969  
Commercial Real Estate [Member]          
Summary of changes in allowance for loan losses          
Beginning Balance 28,595 26,285 27,327 25,873  
Charge-offs (25) (67) (25) (208)  
Recoveries 223 169 412 854  
Provision for loan losses 218 (28) 1,297 (160)  
Ending Balance 29,011 26,359 29,011 26,359  
Ending Balance: Individually Evaluated for Impairment 791 201 791 201 204
Ending Balance: Collectively Evaluated for Impairment 28,220 26,158 28,220 26,158  
Construction Loans [Member]          
Summary of changes in allowance for loan losses          
Beginning Balance 5,100 4,142 5,366 3,945  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision for loan losses 116 (71) (150) 126  
Ending Balance 5,216 4,071 5,216 4,071  
Ending Balance: Individually Evaluated for Impairment 0 0 0 0  
Ending Balance: Collectively Evaluated for Impairment 5,216 4,071 5,216 4,071  
Small Business [Member]          
Summary of changes in allowance for loan losses          
Beginning Balance 1,341 1,222 1,264 1,171  
Charge-offs (30) (47) (93) (196)  
Recoveries 73 66 94 132  
Provision for loan losses 57 7 176 141  
Ending Balance 1,441 1,248 1,441 1,248  
Ending Balance: Individually Evaluated for Impairment 3 4 3 4 4
Ending Balance: Collectively Evaluated for Impairment 1,438 1,244 1,438 1,244  
Residential Real Estate [Member]          
Summary of changes in allowance for loan losses          
Beginning Balance 2,567 2,726 2,590 2,834  
Charge-offs (8) (17) (27) (202)  
Recoveries 51 1 51 46  
Provision for loan losses (32) (159) (36) (127)  
Ending Balance 2,578 2,551 2,578 2,551  
Ending Balance: Individually Evaluated for Impairment 1,188 1,337 1,188 1,337 1,278
Ending Balance: Collectively Evaluated for Impairment 1,390 1,214 1,390 1,214  
Consumer Home Equity [Member]          
Summary of changes in allowance for loan losses          
Beginning Balance 4,915 4,906 4,889 4,956  
Charge-offs (190) (248) (337) (411)  
Recoveries 26 31 53 105  
Provision for loan losses 235 182 381 221  
Ending Balance 4,986 4,871 4,986 4,871  
Ending Balance: Individually Evaluated for Impairment 228 250 228 250 238
Ending Balance: Collectively Evaluated for Impairment 4,758 4,621 4,758 4,621  
Consumer Other [Member]          
Summary of changes in allowance for loan losses          
Beginning Balance 429 677 587 748  
Charge-offs (322) (247) (628) (573)  
Recoveries 250 110 494 301  
Provision for loan losses 111 76 15 140  
Ending Balance 468 616 468 616  
Ending Balance: Individually Evaluated for Impairment 27 30 27 30 $ 23
Ending Balance: Collectively Evaluated for Impairment $ 441 $ 586 $ 441 $ 586