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Allowance for Loan Losses and Credit Quality of Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | $ 64,959 | $ 69,534 | $ 66,359 | $ 69,434 |  |
Charge-offs | (6,374) | (5,977) | (17,422) | (16,047) |  |
Recoveries | 1,308 | 892 | 3,416 | 3,300 |  |
Provision | 4,966 | 4,885 | 12,506 | 12,647 |  |
Balance, end of period | 64,859 | 69,334 | 64,859 | 69,334 |  |
Allowance for loan losses for acquired loan portfolio |  |  | 1,900 | 3,000 |  |
Provision expense and net charge-offs related to acquired loans | 500 | 300 | 1,200 | 500 |  |
Allowance loan losses [Abstract] |  |  |  |  |  |
Allowance for loan losses | 64,959 | 69,534 | 66,359 | 69,434 | $ 64,859 | $ 66,359
Allowance for loans individually evaluated for impairment |  |  |  |  | 3,545 | 1,100
Allowance for loans collectively evaluated for impairment |  |  |  |  | 61,314 | 65,259
Ending balance of loans |  |  |  |  | 5,870,988 | 5,595,271
Commercial Loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 28,326 | 35,123 | 32,433 | 35,090 |  |
Charge-offs | (1,333) | (1,517) | (2,715) | (3,423) |  |
Recoveries | 258 | 253 | 772 | 966 |  |
Provision | (2,800) | 1,779 | (6,039) | 3,005 |  |
Balance, end of period | 24,451 | 35,638 | 24,451 | 35,638 |  |
Allowance loan losses [Abstract] |  |  |  |  |  |
Allowance for loan losses | 28,326 | 35,123 | 32,433 | 35,090 | 24,451 | 32,433
Allowance for loans individually evaluated for impairment |  |  |  |  | 3,545 | 1,100
Allowance for loans collectively evaluated for impairment |  |  |  |  | 20,906 | 31,333
Ending balance of loans |  |  |  |  | 2,602,385 | 2,473,702
Consumer Loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 28,314 | 27,973 | 26,720 | 27,694 |  |
Charge-offs | (4,530) | (3,979) | (13,183) | (11,659) |  |
Recoveries | 889 | 632 | 2,334 | 2,087 |  |
Provision | 7,333 | 2,826 | 16,135 | 9,330 |  |
Balance, end of period | 32,006 | 27,452 | 32,006 | 27,452 |  |
Allowance loan losses [Abstract] |  |  |  |  |  |
Allowance for loan losses | 28,314 | 27,973 | 26,720 | 27,694 | 32,006 | 26,720
Allowance for loans individually evaluated for impairment |  |  |  |  | 0 | 0
Allowance for loans collectively evaluated for impairment |  |  |  |  | 32,006 | 26,720
Ending balance of loans |  |  |  |  | 2,091,408 | 2,005,980
Residential Real Estate Mortgages [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 8,281 | 6,205 | 7,130 | 6,520 |  |
Charge-offs | (511) | (481) | (1,524) | (965) |  |
Recoveries | 161 | 7 | 310 | 247 |  |
Provision | 51 | 212 | 2,066 | 141 |  |
Balance, end of period | 7,982 | 5,943 | 7,982 | 5,943 |  |
Allowance loan losses [Abstract] |  |  |  |  |  |
Allowance for loan losses | 8,281 | 6,205 | 7,130 | 6,520 | 7,982 | 7,130
Allowance for loans individually evaluated for impairment |  |  |  |  | 0 | 0
Allowance for loans collectively evaluated for impairment |  |  |  |  | 7,982 | 7,130
Ending balance of loans |  |  |  |  | 1,177,195 | 1,115,589
Unallocated [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 38 | 233 | 76 | 130 |  |
Charge-offs | 0 | 0 | 0 | 0 |  |
Recoveries | 0 | 0 | 0 | 0 |  |
Provision | 382 | 68 | 344 | 171 |  |
Balance, end of period | 420 | 301 | 420 | 301 |  |
Allowance loan losses [Abstract] |  |  |  |  |  |
Allowance for loan losses | $ 38 | $ 233 | $ 76 | $ 130 | 420 | 76
Allowance for loans collectively evaluated for impairment |  |  |  |  | 420 | 76
Originated Loans [Member] |  |  |  |  |  |
Allowance loan losses [Abstract] |  |  |  |  |  |
Ending balance of loans |  |  |  |  | 5,217,167 | 4,847,937
Ending balance of loans individually evaluated for impairment |  |  |  |  | 26,016 | 20,121
Ending balance of loans collectively evaluated for impairment |  |  |  |  | 5,191,151 | 4,827,816
Originated Loans [Member] | Commercial Loans [Member] |  |  |  |  |  |
Allowance loan losses [Abstract] |  |  |  |  |  |
Ending balance of loans |  |  |  |  | 2,297,178 | 2,140,371
Ending balance of loans individually evaluated for impairment |  |  |  |  | 12,559 | 11,079
Ending balance of loans collectively evaluated for impairment |  |  |  |  | 2,284,619 | 2,129,292
Originated Loans [Member] | Consumer Loans [Member] |  |  |  |  |  |
Allowance loan losses [Abstract] |  |  |  |  |  |
Ending balance of loans |  |  |  |  | 1,984,440 | 1,858,724
Ending balance of loans individually evaluated for impairment |  |  |  |  | 7,590 | 5,498
Ending balance of loans collectively evaluated for impairment |  |  |  |  | 1,976,850 | 1,853,226
Originated Loans [Member] | Residential Real Estate Mortgages [Member] |  |  |  |  |  |
Allowance loan losses [Abstract] |  |  |  |  |  |
Ending balance of loans |  |  |  |  | 935,549 | 848,842
Ending balance of loans individually evaluated for impairment |  |  |  |  | 5,867 | 3,544
Ending balance of loans collectively evaluated for impairment |  |  |  |  | 929,682 | 845,298
Acquired Loans [Member] |  |  |  |  |  |
Allowance loan losses [Abstract] |  |  |  |  |  |
Ending balance of loans |  |  |  |  | 653,821 | 747,334
Ending balance of loans individually evaluated for impairment |  |  |  |  | 9,317 | 5,675
Ending balance of loans collectively evaluated for impairment |  |  |  |  | 644,504 | 741,659
Acquired Loans [Member] | Commercial Loans [Member] |  |  |  |  |  |
Allowance loan losses [Abstract] |  |  |  |  |  |
Ending balance of loans |  |  |  |  | 305,207 | 333,331
Ending balance of loans individually evaluated for impairment |  |  |  |  | 9,317 | 5,675
Ending balance of loans collectively evaluated for impairment |  |  |  |  | 295,890 | 327,656
Acquired Loans [Member] | Consumer Loans [Member] |  |  |  |  |  |
Allowance loan losses [Abstract] |  |  |  |  |  |
Ending balance of loans |  |  |  |  | 106,968 | 147,256
Ending balance of loans individually evaluated for impairment |  |  |  |  | 0 | 0
Ending balance of loans collectively evaluated for impairment |  |  |  |  | 106,968 | 147,256
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] |  |  |  |  |  |
Allowance loan losses [Abstract] |  |  |  |  |  |
Ending balance of loans |  |  |  |  | 241,646 | 266,747
Ending balance of loans individually evaluated for impairment |  |  |  |  | 0 | 0
Ending balance of loans collectively evaluated for impairment |  |  |  |  | $ 241,646 | $ 266,747

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- Definition Reduction to the allowance for credit losses related to acquired financing receivables deemed uncollectible and the sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of acquired loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value. + References No definition available. + Details
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- Definition Amount of addition to allowance reserve for credit loss arising from purchase of loan and lease portfolios. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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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 The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + 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 (g) -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 The balance of financing receivables that were collectively evaluated for impairment. + 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 (h) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + 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 (h) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 + 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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