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Allowance for Loan Losses and Credit Quality of Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Dec. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | $ 63,018 | $ 66,359 |  |
Charge-offs | (6,559) | (5,680) |  |
Recoveries | 1,761 | 1,038 |  |
Provision | 6,098 | 3,642 |  |
Balance, end of period | 64,318 | 65,359 |  |
Allowance for loan losses for acquired loan portfolio | 700 | 1,900 |  |
Provision expense and net charge-offs related to acquired loans | 100 | 600 |  |
Allowance loan losses [Abstract] |  |  |  |
Allowance for loan losses | 63,018 | 66,359 | $ 64,318 | $ 63,018
Allowance for loans individually evaluated for impairment |  |  | 2,970 | 2,005
Allowance for loans collectively evaluated for impairment |  |  | 61,348 | 61,013
Ending balance of loans |  |  | 5,967,809 | 5,883,133
Commercial Loans [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 25,545 | 32,433 |  |
Charge-offs | (437) | (798) |  |
Recoveries | 765 | 234 |  |
Provision | (574) | (591) |  |
Balance, end of period | 25,299 | 31,278 |  |
Allowance loan losses [Abstract] |  |  |  |
Allowance for loan losses | 25,545 | 32,433 | 25,299 | 25,545
Allowance for loans individually evaluated for impairment |  |  | 2,970 | 2,005
Allowance for loans collectively evaluated for impairment |  |  | 22,329 | 23,540
Ending balance of loans |  |  | 2,617,111 | 2,589,707
Consumer Loans [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 29,253 | 26,720 |  |
Charge-offs | (5,413) | (4,378) |  |
Recoveries | 974 | 748 |  |
Provision | 6,221 | 3,066 |  |
Balance, end of period | 31,035 | 26,156 |  |
Allowance loan losses [Abstract] |  |  |  |
Allowance for loan losses | 29,253 | 26,720 | 31,035 | 29,253
Allowance for loans individually evaluated for impairment |  |  | 0 | 0
Allowance for loans collectively evaluated for impairment |  |  | 31,035 | 29,253
Ending balance of loans |  |  | 2,138,877 | 2,096,646
Residential Real Estate Mortgages [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 7,960 | 7,130 |  |
Charge-offs | (709) | (504) |  |
Recoveries | 22 | 56 |  |
Provision | 711 | 1,016 |  |
Balance, end of period | 7,984 | 7,698 |  |
Allowance loan losses [Abstract] |  |  |  |
Allowance for loan losses | 7,960 | 7,130 | 7,984 | 7,960
Allowance for loans individually evaluated for impairment |  |  | 0 | 0
Allowance for loans collectively evaluated for impairment |  |  | 7,984 | 7,960
Ending balance of loans |  |  | 1,211,821 | 1,196,780
Unallocated [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 260 | 76 |  |
Charge-offs | 0 | 0 |  |
Recoveries | 0 | 0 |  |
Provision | (260) | 151 |  |
Balance, end of period | 0 | 227 |  |
Allowance loan losses [Abstract] |  |  |  |
Allowance for loan losses | $ 260 | $ 76 | 0 | 260
Allowance for loans collectively evaluated for impairment |  |  | 0 | 260
Originated Loans [Member] |  |  |  |
Allowance loan losses [Abstract] |  |  |  |
Ending balance of loans |  |  | 5,376,887 | 5,271,619
Ending balance of loans individually evaluated for impairment |  |  | 34,167 | 25,963
Ending balance of loans collectively evaluated for impairment |  |  | 5,342,720 | 5,245,656
Originated Loans [Member] | Commercial Loans [Member] |  |  |  |
Allowance loan losses [Abstract] |  |  |  |
Ending balance of loans |  |  | 2,337,481 | 2,303,978
Ending balance of loans individually evaluated for impairment |  |  | 19,691 | 12,253
Ending balance of loans collectively evaluated for impairment |  |  | 2,317,790 | 2,291,725
Originated Loans [Member] | Consumer Loans [Member] |  |  |  |
Allowance loan losses [Abstract] |  |  |  |
Ending balance of loans |  |  | 2,052,568 | 2,001,219
Ending balance of loans individually evaluated for impairment |  |  | 8,262 | 7,693
Ending balance of loans collectively evaluated for impairment |  |  | 2,044,306 | 1,993,526
Originated Loans [Member] | Residential Real Estate Mortgages [Member] |  |  |  |
Allowance loan losses [Abstract] |  |  |  |
Ending balance of loans |  |  | 986,838 | 966,422
Ending balance of loans individually evaluated for impairment |  |  | 6,214 | 6,017
Ending balance of loans collectively evaluated for impairment |  |  | 980,624 | 960,405
Acquired Loans [Member] |  |  |  |
Allowance loan losses [Abstract] |  |  |  |
Ending balance of loans |  |  | 590,922 | 611,514
Ending balance of loans individually evaluated for impairment |  |  | 1,205 | 1,205
Ending balance of loans collectively evaluated for impairment |  |  | 589,717 | 610,309
Acquired Loans [Member] | Commercial Loans [Member] |  |  |  |
Allowance loan losses [Abstract] |  |  |  |
Ending balance of loans |  |  | 279,630 | 285,729
Ending balance of loans individually evaluated for impairment |  |  | 1,205 | 1,205
Ending balance of loans collectively evaluated for impairment |  |  | 278,425 | 284,524
Acquired Loans [Member] | Consumer Loans [Member] |  |  |  |
Allowance loan losses [Abstract] |  |  |  |
Ending balance of loans |  |  | 86,309 | 95,427
Ending balance of loans individually evaluated for impairment |  |  | 0 | 0
Ending balance of loans collectively evaluated for impairment |  |  | 86,309 | 95,427
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] |  |  |  |
Allowance loan losses [Abstract] |  |  |  |
Ending balance of loans |  |  | 224,983 | 230,358
Ending balance of loans individually evaluated for impairment |  |  | 0 | 0
Ending balance of loans collectively evaluated for impairment |  |  | $ 224,983 | $ 230,358

X
- 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 recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + 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 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 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 loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + 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 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 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 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 Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 50 -Paragraph 11B -Subparagraph (g) -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 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + 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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