Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financial assets measured at fair value on recurring basis [Abstract]
Collateralized mortgage obligations issued or guaranteed by U.S. government agencies	$ 200,987
Collateralized mortgage obligations Non-agency	904
Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Financial assets measured at fair value on recurring basis [Abstract]
Total investment securities available-for-sale	47	47
Financial assets measured at fair value on nonrecurring basis [Abstract]
Loans and leases held for sale	0	0
Significant Other Observable Inputs Level 2 [Member]
Financial assets measured at fair value on recurring basis [Abstract]
Total investment securities available-for-sale	316,912	344,992
Financial assets measured at fair value on nonrecurring basis [Abstract]
Loans and leases held for sale	0	0
Significant Unobservable Inputs Level 3 [Member]
Financial assets measured at fair value on recurring basis [Abstract]
Total investment securities available-for-sale	4,225	4,164
Financial assets measured at fair value on nonrecurring basis [Abstract]
Loans and leases held for sale	1,472	1,572
Recurring [Member]
Financial assets measured at fair value on recurring basis [Abstract]
U.S. government agencies	69,373	66,444
Mortgage-backed securities - residential	32,165	30,509
Collateralized mortgage obligations issued or guaranteed by U.S. government agencies	200,987	233,976
Collateralized mortgage obligations Non-agency	904	1,011
Corporate bonds	7,889	7,437
Municipal bonds	5,594	5,615
Other securities	4,225	4,164
Common stocks	47	47
Total investment securities available-for-sale	321,184	349,203
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Financial assets measured at fair value on recurring basis [Abstract]
U.S. government agencies	0	0
Mortgage-backed securities - residential	0	0
Collateralized mortgage obligations issued or guaranteed by U.S. government agencies	0	0
Collateralized mortgage obligations Non-agency	0	0
Corporate bonds	0	0
Municipal bonds	0	0
Other securities	0	0
Common stocks	47	47
Total investment securities available-for-sale	47	47
Recurring [Member] | Significant Other Observable Inputs Level 2 [Member]
Financial assets measured at fair value on recurring basis [Abstract]
U.S. government agencies	69,373	66,444
Mortgage-backed securities - residential	32,165	30,509
Collateralized mortgage obligations issued or guaranteed by U.S. government agencies	200,987	233,976
Collateralized mortgage obligations Non-agency	904	1,011
Corporate bonds	7,889	7,437
Municipal bonds	5,594	5,615
Other securities	0	0
Common stocks	0	0
Total investment securities available-for-sale	316,912	344,992
Recurring [Member] | Significant Unobservable Inputs Level 3 [Member]
Financial assets measured at fair value on recurring basis [Abstract]
U.S. government agencies	0	0
Mortgage-backed securities - residential	0	0
Collateralized mortgage obligations issued or guaranteed by U.S. government agencies	0	0
Collateralized mortgage obligations Non-agency	0	0
Corporate bonds	0	0
Municipal bonds	0	0
Other securities	4,225	4,164
Common stocks	0	0
Total investment securities available-for-sale	4,225	4,164
Nonrecurring [Member]
Financial assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans and leases	4,896	9,180
Other real estate owned	3,727	7,632
Loans and leases held for sale	1,472	1,572
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Financial assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans and leases	0	0
Other real estate owned	0	0
Loans and leases held for sale	0	0
Nonrecurring [Member] | Significant Other Observable Inputs Level 2 [Member]
Financial assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans and leases	0	0
Other real estate owned	0	0
Loans and leases held for sale	0	0
Nonrecurring [Member] | Significant Unobservable Inputs Level 3 [Member]
Financial assets measured at fair value on nonrecurring basis [Abstract]
Impaired loans and leases	4,896	9,180
Other real estate owned	3,727	7,632
Loans and leases held for sale	$ 1,472	$ 1,572