Deposits (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deposits [Abstract]
Demand and other noninterest-bearing	$ 1,321,171	$ 1,156,610
Interest-bearing demand	870,821	735,340
Money market	1,043,459	1,031,664
Savings	314,371	283,416
Certificates of deposit less than $100,000	252,544	303,405
Total core deposits	3,802,366	3,510,435
Certificates of deposit greater than $100,000	212,924	262,731
Certificates of deposit insured by CDARS®	26,720	42,080
Subtotal	4,042,010	3,815,246
Deposits, Valuation Adjustment From Acquisition Accounting	75	283
Total deposits	4,042,085	3,815,529
Deposit Liabilities Reclassified as Loans Receivable	528	10,100
Time Deposits, Fiscal Year Maturity [Abstract]
2013	183,509
2014	26,989
2015	14,245
2016	10,399
2017	3,524
Thereafter	105
Total	$ 238,771