Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative asset, fair value	$ 83,265	$ 33,398
Derivative liability, fair value	(83,331)	(33,117)
Derivative asset (liability), net	1,507	1,667
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	159,646	87,781
Derivative liability, notional amount	414	267
Derivative asset, fair value	3,023	1,291
Derivative liability, fair value	(4)	(16)
Derivative asset (liability), net	3,019	1,275
Forward Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	0	69,045
Derivative liability, notional amount	137,811	16,193
Derivative asset, fair value	0	205
Derivative liability, fair value	(1,831)	(24)
Derivative asset (liability), net	(1,831)	181
Interest Rate Swap with Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	1,098,942	846,490
Derivative liability, notional amount	8,000	8,757
Derivative asset, fair value	82,874	32,915
Derivative liability, fair value	(14)	(55)
Derivative asset (liability), net	82,860	32,860
Interest Rate Swap with Counterparty [Member]
Derivative [Line Items]
Derivative asset, notional amount	8,000	8,757
Derivative liability, notional amount	1,098,942	846,490
Derivative asset, fair value	14	55
Derivative liability, fair value	(82,874)	(32,915)
Derivative asset (liability), net	(82,860)	(32,860)
Foreign Exchange Contracts With Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	11,577	4,897
Derivative liability, notional amount	6,268	8,050
Derivative asset, fair value	479	114
Derivative liability, fair value	(94)	(184)
Derivative asset (liability), net	385	(70)
Foreign Exchange Contracts With Correspondent Banks [Member]
Derivative [Line Items]
Derivative asset, notional amount	9,595	9,728
Derivative liability, notional amount	15,231	6,899
Derivative asset, fair value	377	428
Derivative liability, fair value	(443)	(147)
Derivative asset (liability), net	$ (66)	$ 281