Off-Balance Sheet Arrangements, Commitments And Contingencies (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Certificates and other time deposits
1 year or less	$ 857,206
More than 1 year but less than 3 years	435,331
3 years or more but less than 5 years	100,407
Total	1,392,944
Federal Home Loan Bank advances
1 year or less	615
More than 1 year but less than 3 years	150,222
Total	150,837
Subordinated Debentures
1 year or less	592
More than 1 year but less than 3 years	592
3 years or more but less than 5 years	1,775
5 years or more	31,404
Total	34,363
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
1 year or less	2,121
More than 1 year but less than 3 years	2,843
3 years or more but less than 5 years	1,810
Operating Leases, Future Minimum Payments, Due Thereafter	4,513
5 years or more	3,925
Total	10,699
Contractual obligations (other than securities sold under agreements to repurchase)
1 year or less	860,534
More than 1 year but less than 3 years	588,988
3 years or more but less than 5 years	103,992
5 years or more	35,329
Total	1,588,843
Interest payments on Federal Home Loan Bank advances to be paid over future periods.	837
Interest included in payments for subordinated debentures	$ 12,200