Fair Value, by Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Investment securities:
Available for sale	$ 14,731	$ 14,883
Loans secured by real estate:
Less allowance for loan losses	66,185	86,745
Carrying Value [Member]
Financial assets:
Cash	51,388	38,540
Cash equivalents	319,295	318,006
Loans held for sale	1,074	2,129
Investment securities:
Available for sale	14,731	14,883
Held for long-term investment	2,639	2,737
Total investment securities	17,370	17,620
Federal Home Loan Bank and Federal Reserve Bank stock	11,106	12,851
Loans secured by real estate:
Commercial Real Estate Loans Fair Value Disclosure	797,345	907,377
Residential Real Estate Loans Fair Value Disclosure	274,389	332,110
Construction Real Estate And Land Development Loans Fair Value Disclosure	65,771	105,268
Real Estate Loans Fair Value Disclosure	1,137,505	1,344,755
Commercial And Other Business Purposes Loans Fair Value Disclosure	134,083	181,349
Consumer Loans Receivable Fair Value Disclosure	10,151	12,228
Other Loans Receivable Fair Value Disclosure	2,450	2,781
Loans Receivable Gross Fair Value Disclosure	1,284,189	1,541,113
Less allowance for loan losses	(66,185)	(86,745)
Loans And Lease Receivable Net Fair Value Disclosure	1,218,004	1,454,368
Deposits:
Noninterest-bearing	360,252	328,896
Interest-bearing:
Demand accounts	488,121	502,866
Time certificates of less than $100,000	344,718	454,833
Time Deposits 100000 Or More Fair Value Disclosure	467,595	571,803
Total interest-bearing	1,300,434	1,529,502
Total deposits	1,660,686	1,858,398
Notes payable and other borrowings	19,487	50,445
Subordinated debentures		149,156
Estimate Fair Value [Member]
Investment securities:
Total investment securities	17,370	16,864
Loans secured by real estate:
Real Estate Loans Fair Value Disclosure	1,134,872	1,340,383
Loans Receivable Gross Fair Value Disclosure	1,281,587	1,536,685
Loans And Lease Receivable Net Fair Value Disclosure	1,215,402	1,449,940
Interest-bearing:
Total interest-bearing	1,306,588	1,538,820
Total deposits	1,666,840	1,867,716
Estimate Fair Value [Member] \| Fair Value, Level 1 [Member]
Financial assets:
Cash	51,388	38,540
Deposits:
Noninterest-bearing	360,252	328,896
Estimate Fair Value [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Cash equivalents	319,295	318,006
Loans held for sale	1,074	2,129
Investment securities:
Available for sale	14,731	14,883
Federal Home Loan Bank and Federal Reserve Bank stock	11,106	12,851
Interest-bearing:
Demand accounts	488,121	502,866
Estimate Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Investment securities:
Held for long-term investment	2,639	1,981
Loans secured by real estate:
Commercial Real Estate Loans Fair Value Disclosure	794,664	903,687
Residential Real Estate Loans Fair Value Disclosure	274,315	331,434
Construction Real Estate And Land Development Loans Fair Value Disclosure	65,893	105,262
Commercial And Other Business Purposes Loans Fair Value Disclosure	133,977	181,350
Consumer Loans Receivable Fair Value Disclosure	10,417	12,406
Other Loans Receivable Fair Value Disclosure	2,321	2,546
Less allowance for loan losses	(66,185)	(86,745)
Interest-bearing:
Time certificates of less than $100,000	347,736	460,012
Time Deposits 100000 Or More Fair Value Disclosure	470,731	575,942
Notes payable and other borrowings	18,082	50,824
Subordinated debentures		$ 123,452

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

No definition available.