Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative asset, fair value	$ 62,818	$ 33,398
Derivative liability, fair value	62,816	33,117
Derivative asset (liability), net	1,888	1,667
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	130,306	87,781
Derivative liability, notional amount	3	267
Derivative asset, fair value	2,507	1,291
Derivative liability, fair value	0	16
Derivative asset (liability), net	2,507	1,275
Forward Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	0	69,045
Derivative liability, notional amount	120,830	16,193
Derivative asset, fair value	0	205
Derivative liability, fair value	925	24
Derivative asset (liability), net	(925)	181
Interest Rate Swap with Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	939,820	846,490
Derivative liability, notional amount	8,000	8,757
Derivative asset, fair value	62,323	32,915
Derivative liability, fair value	32	55
Derivative asset (liability), net	62,291	32,860
Interest Rate Swap with Counterparty [Member]
Derivative [Line Items]
Derivative asset, notional amount	8,000	8,757
Derivative liability, notional amount	939,820	846,490
Derivative asset, fair value	32	55
Derivative liability, fair value	62,323	32,915
Derivative asset (liability), net	(62,291)	(32,860)
Foreign Exchange Contracts With Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	8,661	4,897
Derivative liability, notional amount	6,380	8,050
Derivative asset, fair value	565	114
Derivative liability, fair value	261	184
Derivative asset (liability), net	304	(70)
Foreign Exchange Contracts With Correspondent Banks [Member]
Derivative [Line Items]
Derivative asset, notional amount	10,863	9,728
Derivative liability, notional amount	8,910	6,899
Derivative asset, fair value	463	428
Derivative liability, fair value	461	147
Derivative asset (liability), net	$ 2	$ 281

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
-Paragraph 1A
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-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Nominal or face amount used to calculate payments on the derivative liability.

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