Fair Value (Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Carrying Value
Financial assets:
Cash and short-term investments	$ 64,605	$ 104,367
Securities available for sale	377,670	320,774
Loans held for sale	22,291	26,073
Loans held for investment	967,286	981,387
Agency accounts receivable	201	217
Accrued interest receivable	6,060	6,122
Nonmarketable equity investments	7,394	7,380
Investments in unconsolidated VIEs	3,281	3,425
Mortgage derivative assets	576	269
Financial liabilities:
Noninterest-bearing deposits	236,145	231,718
NOW, MMDA and savings deposits	719,771	707,798
Certificates of deposit	405,422	431,947
Short-term borrowings	3,224	4,398
Other borrowings	40,333	43,001
Junior subordinated debt	30,928	30,928
Agency accounts payable	1,518	641
Accrued interest payable	844	1,023
Mortgage derivative liabilities	304	291
Commitments to extend credit and letters of credit	(2)	(4)
Carrying Value | Interest rate swap
Financial liabilities:
Interest rate swap	(2,349)	(1,834)
Estimate of Fair Value
Financial assets:
Cash and short-term investments	64,605	104,367
Securities available for sale	377,670	320,774
Loans held for sale	22,893	27,053
Loans held for investment	909,021	921,351
Agency accounts receivable	201	217
Accrued interest receivable	6,060	6,122
Nonmarketable equity investments	7,394	7,380
Investments in unconsolidated VIEs	3,281	3,425
Mortgage derivative assets	576	269
Financial liabilities:
Noninterest-bearing deposits	236,145	231,718
NOW, MMDA and savings deposits	719,771	707,798
Certificates of deposit	412,408	439,518
Short-term borrowings	3,224	4,398
Other borrowings	42,130	45,193
Junior subordinated debt	25,250	25,204
Agency accounts payable	1,518	641
Accrued interest payable	844	1,023
Mortgage derivative liabilities	304	291
Commitments to extend credit and letters of credit	(319)	(320)
Estimate of Fair Value | Interest rate swap
Financial liabilities:
Interest rate swap	(2,349)	(1,834)
Estimate of Fair Value | Quoted Prices In Active Markets For Identical Assets (Level 1)
Financial assets:
Cash and short-term investments	64,605
Securities available for sale	0
Loans held for sale	0
Loans held for investment	0
Agency accounts receivable	201
Accrued interest receivable	6
Nonmarketable equity investments	0
Investments in unconsolidated VIEs	0
Mortgage derivative assets	0
Financial liabilities:
Noninterest-bearing deposits	236,145
NOW, MMDA and savings deposits	719,771
Certificates of deposit	0
Short-term borrowings	3,224
Other borrowings	0
Junior subordinated debt	0
Agency accounts payable	1,518
Accrued interest payable	844
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	376,820
Loans held for sale	0
Loans held for investment	0
Agency accounts receivable	0
Accrued interest receivable	1,745
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	850
Loans held for sale	22,893
Loans held for investment	909,021
Agency accounts receivable	0
Accrued interest receivable	4,309
Nonmarketable equity investments	7,394
Investments in unconsolidated VIEs	3,281
Mortgage derivative assets	576
Financial liabilities:
Noninterest-bearing deposits	0
NOW, MMDA and savings deposits	0
Certificates of deposit	412,408
Short-term borrowings	0
Other borrowings	42,130
Junior subordinated debt	25,250
Agency accounts payable	0
Accrued interest payable	844
Mortgage derivative liabilities	304
Commitments to extend credit and letters of credit	(319)
Estimate of Fair Value | Significant Unobservable Inputs (Level 3) | Interest rate swap
Financial liabilities:
Interest rate swap	$ (2,349)