Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative asset, fair value	$ 81,007	$ 33,398
Derivative liability, fair value	(81,339)	(33,117)
Derivative asset (liability), net	2,436	1,667
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	188,543	87,781
Derivative liability, notional amount	611	267
Derivative asset, fair value	3,199	1,291
Derivative liability, fair value	(2)	(16)
Derivative asset (liability), net	3,197	1,275
Forward Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	22,037	69,045
Derivative liability, notional amount	137,181	16,193
Derivative asset, fair value	5	205
Derivative liability, fair value	(866)	(24)
Derivative asset (liability), net	(861)	181
Interest Rate Swap with Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	1,307,072	846,490
Derivative liability, notional amount	8,000	8,757
Derivative asset, fair value	80,930	32,915
Derivative liability, fair value	(18)	(55)
Derivative asset (liability), net	80,912	32,860
Interest Rate Swap with Counterparty [Member]
Derivative [Line Items]
Derivative asset, notional amount	8,000	8,757
Derivative liability, notional amount	1,307,072	846,490
Derivative asset, fair value	18	55
Derivative liability, fair value	(80,930)	(32,915)
Derivative asset (liability), net	(80,912)	(32,860)
Foreign Exchange Contracts With Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	10,904	4,897
Derivative liability, notional amount	1,763	8,050
Derivative asset, fair value	464	114
Derivative liability, fair value	(32)	(184)
Derivative asset (liability), net	432	(70)
Foreign Exchange Contracts With Correspondent Banks [Member]
Derivative [Line Items]
Derivative asset, notional amount	5,619	9,728
Derivative liability, notional amount	7,376	6,899
Derivative asset, fair value	59	428
Derivative liability, fair value	(391)	(147)
Derivative asset (liability), net	$ (332)	$ 281