Allowance for Loan Losses Schedule of Financing Receivable, Allowance for Credit Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Loan and Lease Losses [Roll Forward]
Balance, at beginning of year				$ 12,424				$ 17,179	$ 12,424	$ 17,179	$ 19,461
Provision for loan losses	850	1,160	1,150	1,050	12,542	2,673	996	903	4,210	17,114	3,877
Loans charged-off:
Current period charge-offs									(4,276)	(13,635)	(4,083)
Previously established specific reserves									(718)	(8,363)	(2,302)
Total loans charged-off									(4,994)	(21,998)	(6,385)
Recoveries									545	129	226
Balance, at end of year	12,185				12,424				12,185	12,424	17,179
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, at beginning of year				1,236				1,279	1,236	1,279	867
Provision for loan losses									441	878	1,251
Loans charged-off:
Current period charge-offs									(555)	(936)	(848)
Previously established specific reserves									0	0	0
Total loans charged-off									(555)	(936)	(848)
Recoveries									47	15	9
Balance, at end of year	1,169				1,236				1,169	1,236	1,279
Commercial real estate - owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance, at beginning of year				2,129				1,090	2,129	1,090	1,589
Provision for loan losses									523	4,908	(418)
Loans charged-off:
Current period charge-offs									(191)	(3,440)	(82)
Previously established specific reserves									0	(433)	0
Total loans charged-off									(191)	(3,873)	(82)
Recoveries									9	4	1
Balance, at end of year	2,470				2,129				2,470	2,129	1,090
Commercial real estate - non-owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance, at beginning of year				3,935				6,906	3,935	6,906	6,584
Provision for loan losses									1,423	4,768	1,100
Loans charged-off:
Current period charge-offs									(1,274)	(3,349)	(797)
Previously established specific reserves									(718)	(4,433)	0
Total loans charged-off									(1,992)	(7,782)	(797)
Recoveries									395	43	19
Balance, at end of year	3,761				3,935				3,761	3,935	6,906
Commercial real estate - multifamily
Allowance for Loan and Lease Losses [Roll Forward]
Balance, at beginning of year				370				350	370	350	679
Provision for loan losses									1,148	334	(261)
Loans charged-off:
Current period charge-offs									(592)	(315)	(85)
Previously established specific reserves									0	0	0
Total loans charged-off									(592)	(315)	(85)
Recoveries									0	1	17
Balance, at end of year	926				370				926	370	350
Commercial construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Balance, at beginning of year				1,198				188	1,198	188	892
Provision for loan losses									379	3,935	(785)
Loans charged-off:
Current period charge-offs									(141)	(2,943)	(1)
Previously established specific reserves									0	0	0
Total loans charged-off									(141)	(2,943)	(1)
Recoveries									0	18	82
Balance, at end of year	1,436				1,198				1,436	1,198	188
Commercial participations
Allowance for Loan and Lease Losses [Roll Forward]
Balance, at beginning of year				1,467				4,559	1,467	4,559	6,410
Provision for loan losses									(505)	1,879	1,497
Loans charged-off:
Current period charge-offs									(361)	(1,474)	(1,076)
Previously established specific reserves									0	(3,497)	(2,302)
Total loans charged-off									(361)	(4,971)	(3,378)
Recoveries									0	0	30
Balance, at end of year	601				1,467				601	1,467	4,559
One-to-four family residential
Allowance for Loan and Lease Losses [Roll Forward]
Balance, at beginning of year				1,521				1,356	1,521	1,356	1,727
Provision for loan losses									84	804	385
Loans charged-off:
Current period charge-offs									(536)	(648)	(773)
Previously established specific reserves									0	0	0
Total loans charged-off									(536)	(648)	(773)
Recoveries									32	9	17
Balance, at end of year	1,101				1,521				1,101	1,521	1,356
Home equity lines of credit
Allowance for Loan and Lease Losses [Roll Forward]
Balance, at beginning of year				442				1,309	442	1,309	531
Provision for loan losses									496	(453)	1,066
Loans charged-off:
Current period charge-offs									(398)	(423)	(310)
Previously established specific reserves									0	0	0
Total loans charged-off									(398)	(423)	(310)
Recoveries									12	9	22
Balance, at end of year	552				442				552	442	1,309
Retail construction
Allowance for Loan and Lease Losses [Roll Forward]
Balance, at beginning of year				3				7	3	7	117
Provision for loan losses									53	(4)	(110)
Loans charged-off:
Current period charge-offs									(40)	0	0
Previously established specific reserves									0	0	0
Total loans charged-off									(40)	0	0
Recoveries									0	0	0
Balance, at end of year	16				3				16	3	7
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, at beginning of year				123				135	123	135	65
Provision for loan losses									168	65	152
Loans charged-off:
Current period charge-offs									(188)	(107)	(111)
Previously established specific reserves									0	0	0
Total loans charged-off									(188)	(107)	(111)
Recoveries									50	30	29
Balance, at end of year	$ 153				$ 123				$ 153	$ 123	$ 135