Fair Value (Details 4) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Financial Assets:
Cash and cash equivalents	$ 92,406	$ 174,931	$ 190,234	$ 169,164
Investment securities	269,683	233,580
Federal Home Loan Bank Stock	20,655	20,655
Loans, net, including loans held for sale	1,485,822	1,453,822
Mortgage banking derivative asset		865
Accrued interest receivable	6,819	6,142
Asset Current, Carrying value		1,903,836
Other assets		164,354
Total assets	2,055,672	2,068,190
Financial Liabilities:
Deposits	1,609,350	1,596,241
Advances from Federal Home Loan Bank	81,807	81,841
Securities sold under repurchase agreements	51,991	60,386
Subordinated debentures	36,083	36,083
Accrued interest payable	0	446
Mortgage banking derivative liability		258
Advance payments by borrowers for taxes and insurance	971	1,402
Liabilities Current, Carrying value		1,776,399
Other liabilities		13,664
Total liabilities	1,800,536	1,790,063
Stockholders' equity	255,136	278,127
Total liabilities and stockholders' equity	2,055,672	2,068,190
Assets:
Cash and cash equivalents	92,406	174,931
Investment securities	269,693	233,591
Loans, net, including loans held for sale	1,518,395	1,494,573
Mortgage banking derivative asset		865
Accrued interest receivable	6,819	6,142
Current Asset, Estimated fair value		1,910,102
Liabilities and stockholders' equity:
Deposits	1,614,570	1,603,111
Advances from Federal Home Loan Bank	84,349	85,196
Securities sold under repurchase agreements	51,991	60,386
Subordinated debentures	44,530	31,814
Accrued interest payable		446
Mortgage banking derivative liability		258
Advance payments by borrowers for taxes and insurance		1,402
Other Curernt Liabilities, Estimated fair value		1,782,613
Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Cash and cash equivalents	92,406
Investment securities	69
Loans, net, including loans held for sale	0
Accrued interest receivable	0
Financial Liabilities:
Deposits	271,305
Advances from Federal Home Loan Bank	0
Securities sold under repurchase agreements	0
Subordinated debentures	0
Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Cash and cash equivalents	0
Investment securities	268,317
Loans, net, including loans held for sale	12,201
Accrued interest receivable	1,434
Financial Liabilities:
Deposits	1,343,265
Advances from Federal Home Loan Bank	84,349
Securities sold under repurchase agreements	51,991
Subordinated debentures	0
Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Cash and cash equivalents	0
Investment securities	1,308
Loans, net, including loans held for sale	1,505,707
Accrued interest receivable	5,385
Financial Liabilities:
Deposits	0
Advances from Federal Home Loan Bank	0
Securities sold under repurchase agreements	0
Subordinated debentures	$ 44,530