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Fair Value Accounting and Measurement (Carrying Amounts and Estimated Fair Values of Selected Financial Instruments) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Interest-earning deposits with banks | $ 13,124 | $ 31,200
Securities available for sale | 2,331,359 | 2,278,577
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Assets |  |
Cash and due from banks | 169,697 | 193,038
Interest-earning deposits with banks | 13,124 | 31,200
Securities available for sale | 2,331,359 | 2,278,577
FHLB stock | 10,600 | 10,240
Loans held for sale | 3,245 | 5,846
Loans | 6,157,115 | 6,143,380
FDIC loss-sharing asset | 3,239 | 3,535
Interest rate contracts | 8,598 | 9,012
Liabilities |  |
Deposits | 8,088,827 | 8,059,415
FHLB Advances | 15,483 | 6,493
Repurchase agreements | 46,914 | 80,822
Interest rate contracts | 8,618 | 9,036
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Assets |  |
Cash and due from banks | 169,697 | 193,038
Interest-earning deposits with banks | 13,124 | 31,200
Securities available for sale | 2,331,359 | 2,278,577
FHLB stock | 10,600 | 10,240
Loans held for sale | 3,245 | 5,846
Loans | 6,042,895 | 6,040,439
FDIC loss-sharing asset | 921 | 867
Interest rate contracts | 8,598 | 9,012
Liabilities |  |
Deposits | 8,084,550 | 8,055,168
FHLB Advances | 16,110 | 7,070
Repurchase agreements | 47,099 | 81,131
Interest rate contracts | 8,618 | 9,036
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Assets |  |
Cash and due from banks | 169,697 | 193,038
Interest-earning deposits with banks | 13,124 | 31,200
Securities available for sale | 252 | 800
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 | 7,699,879 | 7,653,122
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 | 2,331,107 | 2,277,777
FHLB stock | 10,600 | 10,240
Loans held for sale | 3,245 | 5,846
Loans | 0 | 0
FDIC loss-sharing asset | 0 | 0
Interest rate contracts | 8,598 | 9,012
Liabilities |  |
Deposits | 384,671 | 402,046
FHLB Advances | 16,110 | 7,070
Repurchase agreements | 47,099 | 81,131
Interest rate contracts | 8,618 | 9,036
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 | 6,042,895 | 6,040,439
FDIC loss-sharing asset | 921 | 867
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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