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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 |

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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