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Allowance for Loan Losses and Credit Quality of Loans, Allowance for Loan Losses and Recorded Investment (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Allowance for loan losses and recorded investment by portfolio segment [Abstract] |  |  |  |
Allowance for loan losses | $ 63,018 | $ 66,359 | $ 69,434 | $ 69,334
Allowance for loans individually evaluated for impairment | 2,005 | 1,100 |  |
Allowance for loans collectively evaluated for impairment | 61,013 | 65,259 |  |
Ending balance of loans | 5,883,133 | 5,595,271 |  |
Commercial Loans [Member] |  |  |  |
Allowance for loan losses and recorded investment by portfolio segment [Abstract] |  |  |  |
Allowance for loan losses | 25,545 | 32,433 | 35,090 | 35,624
Allowance for loans individually evaluated for impairment | 2,005 | 1,100 |  |
Allowance for loans collectively evaluated for impairment | 23,540 | 31,333 |  |
Ending balance of loans | 2,589,707 | 2,479,745 |  |
Consumer Loans [Member] |  |  |  |
Allowance for loan losses and recorded investment by portfolio segment [Abstract] |  |  |  |
Allowance for loan losses | 29,253 | 26,720 | 27,694 | 27,162
Allowance for loans individually evaluated for impairment | 0 | 0 |  |
Allowance for loans collectively evaluated for impairment | 29,253 | 26,720 |  |
Ending balance of loans | 2,096,646 | 1,999,811 |  |
Residential Real Estate Mortgages [Member] |  |  |  |
Allowance for loan losses and recorded investment by portfolio segment [Abstract] |  |  |  |
Allowance for loan losses | 7,960 | 7,130 | 6,520 | 6,252
Allowance for loans individually evaluated for impairment | 0 | 0 |  |
Allowance for loans collectively evaluated for impairment | 7,960 | 7,130 |  |
Ending balance of loans | 1,196,780 | 1,115,715 |  |
Unallocated [Member] |  |  |  |
Allowance for loan losses and recorded investment by portfolio segment [Abstract] |  |  |  |
Allowance for loan losses | 260 | 76 | $ 130 | $ 296
Allowance for loans collectively evaluated for impairment | 260 | 76 |  |
Originated Loans [Member] |  |  |  |
Allowance for loan losses and recorded investment by portfolio segment [Abstract] |  |  |  |
Ending balance of loans | 5,271,619 | 4,847,937 |  |
Ending balance of loans individually evaluated for impairment | 25,963 | 20,121 |  |
Ending balance of loans collectively evaluated for impairment | 5,245,656 | 4,827,816 |  |
Originated Loans [Member] | Commercial Loans [Member] |  |  |  |
Allowance for loan losses and recorded investment by portfolio segment [Abstract] |  |  |  |
Ending balance of loans | 2,303,978 | 2,140,371 |  |
Ending balance of loans individually evaluated for impairment | 12,253 | 11,079 |  |
Ending balance of loans collectively evaluated for impairment | 2,291,725 | 2,135,335 |  |
Originated Loans [Member] | Consumer Loans [Member] |  |  |  |
Allowance for loan losses and recorded investment by portfolio segment [Abstract] |  |  |  |
Ending balance of loans | 2,001,219 | 1,858,724 |  |
Ending balance of loans individually evaluated for impairment | 7,693 | 5,498 |  |
Ending balance of loans collectively evaluated for impairment | 1,993,526 | 1,847,057 |  |
Originated Loans [Member] | Residential Real Estate Mortgages [Member] |  |  |  |
Allowance for loan losses and recorded investment by portfolio segment [Abstract] |  |  |  |
Ending balance of loans | 966,422 | 848,842 |  |
Ending balance of loans individually evaluated for impairment | 6,017 | 3,544 |  |
Ending balance of loans collectively evaluated for impairment | 960,405 | 845,424 |  |
Acquired Loans [Member] |  |  |  |
Allowance for loan losses and recorded investment by portfolio segment [Abstract] |  |  |  |
Allowance for loan losses | 700 | 500 |  |
Ending balance of loans | 611,514 | 747,334 |  |
Ending balance of loans individually evaluated for impairment | 1,205 | 5,675 |  |
Ending balance of loans collectively evaluated for impairment | 610,309 | 741,659 |  |
Acquired Loans [Member] | Commercial Loans [Member] |  |  |  |
Allowance for loan losses and recorded investment by portfolio segment [Abstract] |  |  |  |
Ending balance of loans | 285,729 | 333,331 |  |
Ending balance of loans individually evaluated for impairment | 1,205 | 5,675 |  |
Ending balance of loans collectively evaluated for impairment | 284,524 | 327,656 |  |
Acquired Loans [Member] | Consumer Loans [Member] |  |  |  |
Allowance for loan losses and recorded investment by portfolio segment [Abstract] |  |  |  |
Ending balance of loans | 95,427 | 147,256 |  |
Ending balance of loans individually evaluated for impairment | 0 | 0 |  |
Ending balance of loans collectively evaluated for impairment | 95,427 | 147,256 |  |
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] |  |  |  |
Allowance for loan losses and recorded investment by portfolio segment [Abstract] |  |  |  |
Ending balance of loans | 230,358 | 266,747 |  |
Ending balance of loans individually evaluated for impairment | 0 | 0 |  |
Ending balance of loans collectively evaluated for impairment | $ 230,358 | $ 266,747 |  |

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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 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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