Off-Balance Sheet Arrangements, Commitments And Contingencies (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Certificates and other time deposits
1 year or less	$ 868,175
More than 1 year but less than 3 years	440,617
3 years or more but less than 5 years	43,667
Total	1,352,459	$ 1,365,449
Federal Home Loan Bank advances
1 year or less	306,265
Total	306,265
Subordinated Debentures
1 year or less	3,780
More than 1 year but less than 3 years	3,656
3 years or more but less than 5 years	9,347
5 years or more	81,256
Total	98,039
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
1 year or less	2,338
More than 1 year but less than 3 years	3,112
3 years or more but less than 5 years	2,113
Operating Leases, Future Minimum Payments, Due Thereafter	3,728
5 years or more	3,326
Total	10,889
Contractual obligations (other than securities sold under agreements to repurchase)
1 year or less	1,180,558
More than 1 year but less than 3 years	447,385
3 years or more but less than 5 years	55,127
5 years or more	84,582
Total	1,767,652
Interest payments on Federal Home Loan Bank advances to be paid over future periods.	1,300
Interest included in payments for subordinated debentures	$ 40,900