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Fair Value Accounting and Measurement (Carrying Amounts and Estimated Fair Values of Selected Financial Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Assets |  |
Interest-earning deposits with banks | $ 22,578 | $ 16,949
Securities available for sale | 2,027,424 | 2,098,257
Liabilities |  |
Other borrowings | 0 | 8,248
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Assets |  |
Cash and due from banks | 149,610 | 171,221
Interest-earning deposits with banks | 22,578 | 16,949
Securities available for sale | 2,027,424 | 2,098,257
FHLB stock | 10,242 | 33,365
Loans held for sale | 6,637 | 1,116
Loans | 5,677,462 | 5,375,809
FDIC loss-sharing asset | 8,146 | 15,174
Interest rate contracts | 14,548 | 11,800
Liabilities |  |
Deposits | 7,314,805 | 6,924,722
FHLB Advances | 6,540 | 216,568
Repurchase agreements | 73,182 | 105,080
Interest rate contracts | 14,602 | 11,851
Other borrowings |  | 8,248
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Assets |  |
Cash and due from banks | 149,610 | 171,221
Interest-earning deposits with banks | 22,578 | 16,949
Securities available for sale | 2,027,424 | 2,098,257
FHLB stock | 10,242 | 33,365
Loans held for sale | 6,637 | 1,116
Loans | 5,783,474 | 5,516,286
FDIC loss-sharing asset | 2,140 | 4,054
Interest rate contracts | 14,548 | 11,800
Liabilities |  |
Deposits | 7,312,329 | 6,921,804
FHLB Advances | 7,198 | 217,296
Repurchase agreements | 74,046 | 106,171
Interest rate contracts | 14,602 | 11,851
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Assets |  |
Cash and due from banks | 149,610 | 171,221
Interest-earning deposits with banks | 22,578 | 16,949
Securities available for sale | 20,400 | 20,499
FHLB stock | 0 | 0
Loans held for sale | 0 | 0
Loans | 0 | 0
FDIC loss-sharing asset | 0 | 0
Interest rate contracts | 0 | 0
Liabilities |  |
Deposits | 6,844,014 | 6,416,017
FHLB Advances | 0 | 0
Repurchase agreements | 0 | 0
Interest rate contracts | 0 | 0
Other Liabilities, Fair Value Disclosure |  | 0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Assets |  |
Cash and due from banks | 0 | 0
Interest-earning deposits with banks | 0 | 0
Securities available for sale | 2,007,024 | 2,077,758
FHLB stock | 10,242 | 33,365
Loans held for sale | 6,637 | 1,116
Loans | 0 | 0
FDIC loss-sharing asset | 0 | 0
Interest rate contracts | 14,548 | 11,800
Liabilities |  |
Deposits | 468,315 | 505,787
FHLB Advances | 7,198 | 217,296
Repurchase agreements | 74,046 | 106,171
Interest rate contracts | 14,602 | 11,851
Other Liabilities, Fair Value Disclosure |  | 8,248
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Assets |  |
Cash and due from banks | 0 | 0
Interest-earning deposits with banks | 0 | 0
Securities available for sale | 0 | 0
FHLB stock | 0 | 0
Loans held for sale | 0 | 0
Loans | 5,783,474 | 5,516,286
FDIC loss-sharing asset | 2,140 | 4,054
Interest rate contracts | 0 | 0
Liabilities |  |
Deposits | 0 | 0
FHLB Advances | 0 | 0
Repurchase agreements | 0 | 0
Interest rate contracts | $ 0 | 0
Other Liabilities, Fair Value Disclosure |  | $ 0

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- Definition For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.2) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6476743&loc=d3e59706-112781 + Details
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