Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative asset, fair value	$ 43,195	$ 41,636
Derivative liability, fair value	(41,252)	(41,842)
Derivative asset (liability), net	3,447	2,824
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	120,577	87,119
Derivative liability, notional amount	3,761	18,239
Derivative asset, fair value	1,509	863
Derivative liability, fair value	(28)	(227)
Derivative asset (liability), net	1,481	636
Forward Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	20,362	70,031
Derivative liability, notional amount	81,615	19,964
Derivative asset, fair value	21	2,223
Derivative liability, fair value	(289)	(112)
Derivative asset (liability), net	(268)	2,111
Interest Rate Swap with Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	1,024,684	876,744
Derivative liability, notional amount	625,050	583,060
Derivative asset, fair value	24,810	24,397
Derivative liability, fair value	(18,226)	(16,998)
Derivative asset (liability), net	6,584	7,399
Interest Rate Swap With Counterparty [Member]
Derivative [Line Items]
Derivative asset, notional amount	625,050	583,060
Derivative liability, notional amount	1,024,684	876,744
Derivative asset, fair value	18,226	16,998
Derivative liability, fair value	(22,624)	(24,397)
Derivative asset (liability), net	(4,398)	(7,399)
Centrally Cleared Interest Rate Swap with Counterparty [Member]
Derivative [Line Items]
Derivative liability, notional amount	134,900
Derivative liability, fair value	0
Foreign Exchange Contracts With Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	8,184	11,674
Derivative liability, notional amount	5,035	4,659
Derivative asset, fair value	428	504
Derivative liability, fair value	(137)	(221)
Derivative asset (liability), net	291	283
Foreign Exchange Contracts With Correspondent Banks [Member]
Derivative [Line Items]
Derivative asset, notional amount	9,260	7,040
Derivative liability, notional amount	10,198	12,869
Derivative asset, fair value	159	241
Derivative liability, fair value	(402)	(447)
Derivative asset (liability), net	$ (243)	$ (206)

Nominal or face amount used to calculate payments on the derivative asset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Nominal or face amount used to calculate payments on the derivative liability.

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