Fair Value (Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Carrying Value
Financial assets:
Cash and short-term investments	$ 74,133	$ 159,124
Securities available for sale	377,051	348,562
Loans held for sale	17,573	21,014
Loans held for investment	969,388	957,981
Agency accounts receivable	155	151
Accrued interest receivable	5,863	5,683
Nonmarketable equity investments	2,022	2,201
Investments in unconsolidated VIEs	3,062	3,136
Mortgage derivative assets	278	317
Financial liabilities:
Noninterest-bearing deposits	252,453	276,295
NOW, MMDA and savings deposits	747,035	755,675
Certificates of deposit	353,287	370,705
Short-term borrowings	2,250	3,720
Other borrowings	34,877	36,007
Junior subordinated debt	30,928	30,928
Agency accounts payable	642	612
Accrued interest payable	628	661
Mortgage derivative liabilities	125	126
Commitments to extend credit and letters of credit	(2)	(3)
Carrying Value | Interest rate swap
Financial liabilities:
Interest rate swap	(2,396)	(2,484)
Estimate of Fair Value
Financial assets:
Cash and short-term investments	74,133	159,124
Securities available for sale	377,051	348,562
Loans held for sale	17,682	21,398
Loans held for investment	876,285	860,071
Agency accounts receivable	155	151
Accrued interest receivable	5,863	5,683
Nonmarketable equity investments	2,022	2,201
Investments in unconsolidated VIEs	3,062	3,136
Mortgage derivative assets	278	317
Financial liabilities:
Noninterest-bearing deposits	252,453	276,295
NOW, MMDA and savings deposits	747,035	755,675
Certificates of deposit	358,614	377,459
Short-term borrowings	2,250	3,720
Other borrowings	36,019	37,441
Junior subordinated debt	26,232	25,795
Agency accounts payable	642	612
Accrued interest payable	628	661
Mortgage derivative liabilities	125	126
Commitments to extend credit and letters of credit	(368)	(346)
Estimate of Fair Value | Interest rate swap
Financial liabilities:
Interest rate swap	(2,396)	(2,484)
Estimate of Fair Value | Quoted Prices In Active Markets For Identical Assets (Level 1)
Financial assets:
Cash and short-term investments	74,133	159,124
Securities available for sale	0	0
Loans held for sale	0	0
Loans held for investment	0	0
Agency accounts receivable	155	151
Accrued interest receivable	13	7
Nonmarketable equity investments	0	0
Investments in unconsolidated VIEs	0	0
Mortgage derivative assets	0	0
Financial liabilities:
Noninterest-bearing deposits	252,453	276,295
NOW, MMDA and savings deposits	747,035	755,675
Certificates of deposit	0	0
Short-term borrowings	2,250	3,720
Other borrowings	0	0
Junior subordinated debt	0	0
Agency accounts payable	642	612
Accrued interest payable	31	23
Mortgage derivative liabilities	0	0
Commitments to extend credit and letters of credit	0	0
Estimate of Fair Value | Quoted Prices In Active Markets For Identical Assets (Level 1) | Interest rate swap
Financial liabilities:
Interest rate swap	0	0
Estimate of Fair Value | Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and short-term investments	0	0
Securities available for sale	376,095	347,616
Loans held for sale	0	0
Loans held for investment	0	0
Agency accounts receivable	0	0
Accrued interest receivable	1,742	1,682
Nonmarketable equity investments	0	0
Investments in unconsolidated VIEs	0	0
Mortgage derivative assets	0	0
Financial liabilities:
Noninterest-bearing deposits	0	0
NOW, MMDA and savings deposits	0	0
Certificates of deposit	0	0
Short-term borrowings	0	0
Other borrowings	0	0
Junior subordinated debt	0	0
Agency accounts payable	0	0
Accrued interest payable	0	0
Mortgage derivative liabilities	0	0
Commitments to extend credit and letters of credit	0	0
Estimate of Fair Value | Significant Other Observable Inputs (Level 2) | Interest rate swap
Financial liabilities:
Interest rate swap	0	0
Estimate of Fair Value | Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and short-term investments	0	0
Securities available for sale	956	946
Loans held for sale	17,682	21,398
Loans held for investment	876,285	860,071
Agency accounts receivable	0	0
Accrued interest receivable	4,108	3,994
Nonmarketable equity investments	2,022	2,201
Investments in unconsolidated VIEs	3,062	3,136
Mortgage derivative assets	278	317
Financial liabilities:
Noninterest-bearing deposits	0	0
NOW, MMDA and savings deposits	0	0
Certificates of deposit	358,614	377,459
Short-term borrowings	0	0
Other borrowings	36,019	37,441
Junior subordinated debt	26,232	25,795
Agency accounts payable	0	0
Accrued interest payable	597	638
Mortgage derivative liabilities	125	126
Commitments to extend credit and letters of credit	(368)	(346)
Estimate of Fair Value | Significant Unobservable Inputs (Level 3) | Interest rate swap
Financial liabilities:
Interest rate swap	$ (2,396)	$ (2,484)