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Fair Value Accounting and Measurement (Carrying Amounts and Estimated Fair Values of Selected Financial Instruments) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Interest-earning deposits with banks | $ 11,216 | $ 8,373
Securities available for sale | 2,279,552 | 2,157,694
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Assets |  |
Cash and due from banks | 167,172 | 166,929
Interest-earning deposits with banks | 11,216 | 8,373
Securities available for sale | 2,279,552 | 2,157,694
FHLB stock | 18,161 | 12,722
Loans held for sale | 7,649 | 4,509
Loans | 6,037,839 | 5,746,855
FDIC loss-sharing asset | 4,266 | 6,568
Interest rate contracts | 21,904 | 12,438
Liabilities |  |
Deposits | 7,673,213 | 7,438,829
FHLB Advances | 204,512 | 68,531
Repurchase agreements | 89,218 | 99,699
Interest rate contracts | 21,951 | 12,478
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Assets |  |
Cash and due from banks | 167,172 | 166,929
Interest-earning deposits with banks | 11,216 | 8,373
Securities available for sale | 2,279,552 | 2,157,694
FHLB stock | 18,161 | 12,722
Loans held for sale | 7,649 | 4,509
Loans | 6,171,314 | 5,752,423
FDIC loss-sharing asset | 1,229 | 921
Interest rate contracts | 21,904 | 12,438
Liabilities |  |
Deposits | 7,670,628 | 7,434,787
FHLB Advances | 205,818 | 69,176
Repurchase agreements | 89,645 | 100,346
Interest rate contracts | 21,951 | 12,478
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Assets |  |
Cash and due from banks | 167,172 | 166,929
Interest-earning deposits with banks | 11,216 | 8,373
Securities available for sale | 549 | 20,137
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 | 7,251,213 | 6,979,924
FHLB Advances | 0 | 0
Repurchase agreements | 0 | 0
Interest rate contracts | 0 | 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 | 2,279,003 | 2,137,557
FHLB stock | 18,161 | 12,722
Loans held for sale | 7,649 | 4,509
Loans | 0 | 0
FDIC loss-sharing asset | 0 | 0
Interest rate contracts | 21,904 | 12,438
Liabilities |  |
Deposits | 419,415 | 454,863
FHLB Advances | 205,818 | 69,176
Repurchase agreements | 89,645 | 100,346
Interest rate contracts | 21,951 | 12,478
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 | 6,171,314 | 5,752,423
FDIC loss-sharing asset | 1,229 | 921
Interest rate contracts | 0 | 0
Liabilities |  |
Deposits | 0 | 0
FHLB Advances | 0 | 0
Repurchase agreements | 0 | 0
Interest rate contracts | $ 0 | $ 0

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