Off-Balance Sheet Arrangements, Commitments And Contingencies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Certificates and other time deposits
1 year or less	$ 865,849
More than 1 year but less than 3 years	404,159
3 years or more but less than 5 years	124,390
Total	1,394,398
Federal Home Loan Bank advances
1 year or less	217,069
More than 1 year but less than 3 years	112,487
3 years or more but less than 5 years	94
5 years or more	508
Total	330,158
Subordinated Debentures
1 year or less	541
More than 1 year but less than 3 years	541
3 years or more but less than 5 years	1,624
5 years or more	30,894
Total	33,600
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
1 year or less	1,857
More than 1 year but less than 3 years	3,365
3 years or more but less than 5 years	1,919
Operating Leases, Future Minimum Payments, Due Thereafter	3,841
5 years or more	3,841
Total	10,982
Contractual obligations (other than securities sold under agreements to repurchase)
1 year or less	1,085,316
More than 1 year but less than 3 years	520,552
3 years or more but less than 5 years	128,027
5 years or more	35,243
Total	1,769,138
Interest expense on subordinated debentures	$ 237