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Allowance for Loan Losses and Credit Quality of Loans, Changes in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance, beginning of period $ 66,359 $ 69,434 $ 69,334
Charge-offs (26,087) (27,473) (27,689)
Recoveries 4,461 4,859 5,365
Provision 18,285 19,539 22,424
Balance, end of period 63,018 66,359 69,434
Commercial Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance, beginning of period 32,433 35,090 35,624
Charge-offs (5,718) (9,414) (10,459)
Recoveries 1,014 1,774 1,957
Provision (2,184) 4,983 7,968
Balance, end of period 25,545 32,433 35,090
Consumer Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance, beginning of period 26,720 27,694 27,162
Charge-offs (18,140) (16,642) (15,459)
Recoveries 3,127 2,800 3,136
Provision 17,546 12,868 12,855
Balance, end of period 29,253 26,720 27,694
Residential Real Estate Mortgages [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance, beginning of period 7,130 6,520 6,252
Charge-offs (2,229) (1,417) (1,771)
Recoveries 320 285 272
Provision 2,739 1,742 1,767
Balance, end of period 7,960 7,130 6,520
Unallocated [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance, beginning of period 76 130 296
Charge-offs 0 0 0
Recoveries 0 0 0
Provision 184 (54) (166)
Balance, end of period 260 76 $ 130
Acquired Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance, beginning of period 500    
Charge-offs (2,700) (4,800)  
Balance, end of period $ 700 $ 500