Off-Balance Sheet Arrangements, Commitments And Contingencies (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)
Certificates and other time deposits
1 year or less	$ 892,229	$ 892,229
More than 1 year but less than 3 years	393,581	393,581
3 years or more but less than 5 years	129,144	129,144
Total	1,414,954	1,414,954
Federal Home Loan Bank advances
1 year or less	728	728
More than 1 year but less than 3 years	150,443	150,443
Total	151,171	151,171
Subordinated Debentures
1 year or less	548	548
More than 1 year but less than 3 years	548	548
3 years or more but less than 5 years	1,643	1,643
5 years or more	30,854	30,854
Total	33,593	33,593
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
1 year or less	2,241	2,241
More than 1 year but less than 3 years	2,898	2,898
3 years or more but less than 5 years	1,695	1,695
Operating Leases, Future Minimum Payments, Due Thereafter	3,841	3,841
5 years or more	3,507	3,507
Total	10,341	10,341
Contractual obligations (other than securities sold under agreements to repurchase)
1 year or less	895,746	895,746
More than 1 year but less than 3 years	547,470	547,470
3 years or more but less than 5 years	132,482	132,482
5 years or more	34,361	34,361
Total	1,610,059	1,610,059
Interest expense on subordinated debentures	$ 243	$ 480