Fair Value (Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Carrying Value
Financial assets:
Cash and short-term investments	$ 84,382	$ 104,367
Securities available for sale	354,188	320,774
Loans held for sale	23,548	26,073
Loans held for investment	970,671	981,387
Agency accounts receivable	322	217
Accrued interest receivable	6,123	6,122
Nonmarketable equity investments	2,197	7,380
Investments in unconsolidated VIEs	3,209	3,425
Mortgage derivative assets	862	269
Financial liabilities:
Noninterest-bearing deposits	233,684	231,718
NOW, MMDA and savings deposits	720,395	707,798
Certificates of deposit	395,395	431,947
Short-term borrowings	5,225	4,398
Other borrowings	38,984	43,001
Junior subordinated debt	30,928	30,928
Agency accounts payable	859	641
Accrued interest payable	806	1,023
Mortgage derivative liabilities	501	291
Commitments to extend credit and letters of credit	(5)	(4)
Carrying Value | Interest rate swap
Financial liabilities:
Interest rate swap	(2,653)	(1,834)
Estimate of Fair Value
Financial assets:
Cash and short-term investments	84,382	104,367
Securities available for sale	354,188	320,774
Loans held for sale	24,450	27,053
Loans held for investment	900,750	921,351
Agency accounts receivable	322	217
Accrued interest receivable	6,123	6,122
Nonmarketable equity investments	2,197	7,380
Investments in unconsolidated VIEs	3,209	3,425
Mortgage derivative assets	862	269
Financial liabilities:
Noninterest-bearing deposits	233,684	231,718
NOW, MMDA and savings deposits	720,395	707,798
Certificates of deposit	401,738	439,518
Short-term borrowings	5,225	4,398
Other borrowings	40,600	45,193
Junior subordinated debt	25,224	25,204
Agency accounts payable	859	641
Accrued interest payable	806	1,023
Mortgage derivative liabilities	501	291
Commitments to extend credit and letters of credit	(340)	(320)
Estimate of Fair Value | Interest rate swap
Financial liabilities:
Interest rate swap	(2,653)	(1,834)
Estimate of Fair Value | Quoted Prices In Active Markets For Identical Assets (Level 1)
Financial assets:
Cash and short-term investments	84,382
Securities available for sale	0
Loans held for sale	0
Loans held for investment	0
Agency accounts receivable	322
Accrued interest receivable	14
Nonmarketable equity investments	0
Investments in unconsolidated VIEs	0
Mortgage derivative assets	0
Financial liabilities:
Noninterest-bearing deposits	233,684
NOW, MMDA and savings deposits	720,395
Certificates of deposit	0
Short-term borrowings	5,225
Other borrowings	0
Junior subordinated debt	0
Agency accounts payable	859
Accrued interest payable	51
Mortgage derivative liabilities	0
Commitments to extend credit and letters of credit	0
Estimate of Fair Value | Quoted Prices In Active Markets For Identical Assets (Level 1) | Interest rate swap
Financial liabilities:
Interest rate swap	0
Estimate of Fair Value | Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and short-term investments	0
Securities available for sale	353,333
Loans held for sale	0
Loans held for investment	0
Agency accounts receivable	0
Accrued interest receivable	1,668
Nonmarketable equity investments	0
Investments in unconsolidated VIEs	0
Mortgage derivative assets	0
Financial liabilities:
Noninterest-bearing deposits	0
NOW, MMDA and savings deposits	0
Certificates of deposit	0
Short-term borrowings	0
Other borrowings	0
Junior subordinated debt	0
Agency accounts payable	0
Accrued interest payable	0
Mortgage derivative liabilities	0
Commitments to extend credit and letters of credit	0
Estimate of Fair Value | Significant Other Observable Inputs (Level 2) | Interest rate swap
Financial liabilities:
Interest rate swap	0
Estimate of Fair Value | Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and short-term investments	0
Securities available for sale	855
Loans held for sale	24,450
Loans held for investment	900,750
Agency accounts receivable	0
Accrued interest receivable	4,441
Nonmarketable equity investments	2,197
Investments in unconsolidated VIEs	3,209
Mortgage derivative assets	862
Financial liabilities:
Noninterest-bearing deposits	0
NOW, MMDA and savings deposits	0
Certificates of deposit	401,738
Short-term borrowings	0
Other borrowings	40,600
Junior subordinated debt	25,224
Agency accounts payable	0
Accrued interest payable	755
Mortgage derivative liabilities	501
Commitments to extend credit and letters of credit	(340)
Estimate of Fair Value | Significant Unobservable Inputs (Level 3) | Interest rate swap
Financial liabilities:
Interest rate swap	$ (2,653)