Loans and Leases - Aging Analysis of Past Due Payments for Each Loan Portfolio Segment (Details) (USD $)	3 Months Ended			9 Months Ended			12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	$ 1,562,000			$ 1,562,000			$ 2,635,000
60-89 Days Past Due	3,571,000			3,571,000			1,988,000
Accruing 90+Days	0			0			0
Total non-accrual LHFI, loan balance	13,468,000			13,468,000			21,432,000
Current	358,728,000			358,728,000			318,627,000
Subtotal LHFI	377,329,000		343,564,000	377,329,000		343,564,000	344,682,000
Less: Deferred loan fees	0	[1]		0	[1]		(517,000)	[1]
Total loans and leases	377,329,000			377,329,000			344,165,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	13,468,000			13,468,000			21,432,000
Total non-accrual LHFI, Specific reserves	660,000			660,000			2,026,000
Non-accrual loans held for sale [Abstract]
Total non-accrual LHFS, Loan balance	0			0			1,572,000
Total non-accrual LHFS, Specific reserves	0			0			0
Total non-accrual loans, Loan balance	13,468,000			13,468,000			23,004,000
Total non-accrual loans, specific reserves	660,000			660,000			2,026,000
Period decrease in nonaccrual loans				9,500,000
Reduction in existing non accrual loan balances				8,500,000
Addition of non accrual loan balance				3,700,000
Change in the non accrual loans [Abstract]
Charge-offs to the allowance for loan and lease losses	837,000		2,080,000	3,079,000		2,861,000	6,271,000
Interest income lost on non-accrual loans	370,000			1,300,000
Cash collected on non accrual and impaired loan				10,600,000		22,300,000
Amount credited to principal balance outstanding				9,900,000		20,100,000
Summary of impaired loans [Abstract]
Impaired loans with a valuation allowance	5,550,000			5,550,000			9,405,000
Impaired loans without a valuation allowance	17,868,000			17,868,000			19,423,000
Impaired LHFS	0			0			1,572,000
Total impaired loans	23,418,000			23,418,000			30,400,000
Total non-accrual loans, specific reserves	660,000			660,000			2,026,000
Non-accrual Loans Held For Investment [Member]
Non-accrual loans held for investment [Abstract]
Non-accrual loans transfer to other real estate owned				1,500,000
Change in the non accrual loans [Abstract]
Charge-offs to the allowance for loan and lease losses				3,200,000
Commercial Real Estate [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	1,005,000			1,005,000			1,548,000
60-89 Days Past Due	3,152,000			3,152,000			1,486,000
Accruing 90+Days	0			0			0
Total non-accrual LHFI, loan balance	5,477,000			5,477,000			10,345,000
Current	148,589,000			148,589,000			153,736,000
Subtotal LHFI							167,115,000
Total loans and leases	158,223,000			158,223,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	5,477,000			5,477,000			10,345,000
Total non-accrual LHFI, Specific reserves	230,000			230,000			835,000
Non-accrual loans held for sale [Abstract]
Total non-accrual LHFS, Loan balance	0			0			1,572,000
Total non-accrual LHFS, Specific reserves	0			0			0
Total non-accrual loans, specific reserves	230,000			230,000			835,000
Summary of impaired loans [Abstract]
Total non-accrual loans, specific reserves	230,000			230,000			835,000
Construction and Land Development [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	0			0			0
60-89 Days Past Due	0			0			0
Accruing 90+Days	0			0			0
Total non-accrual LHFI, loan balance	2,699,000			2,699,000			4,280,000
Current	36,895,000			36,895,000			32,935,000
Subtotal LHFI	39,594,000			39,594,000			37,215,000
Total loans and leases	39,594,000			39,594,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	2,699,000			2,699,000			4,280,000
Total non-accrual LHFI, Specific reserves	0			0			820,000
Non-accrual loans held for sale [Abstract]
Total non-accrual loans, specific reserves	0			0			820,000
Summary of impaired loans [Abstract]
Total non-accrual loans, specific reserves	0			0			820,000
Commercial and Industrial [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	109,000			109,000			200,000
60-89 Days Past Due	0			0			0
Accruing 90+Days	0			0			0
Total non-accrual LHFI, loan balance	3,855,000			3,855,000			4,961,000
Current	82,437,000			82,437,000			35,399,000
Subtotal LHFI							40,560,000
Total loans and leases	86,401,000			86,401,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	3,855,000			3,855,000			4,961,000
Total non-accrual LHFI, Specific reserves	209,000			209,000			255,000
Non-accrual loans held for sale [Abstract]
Total non-accrual loans, specific reserves	209,000			209,000			255,000
Summary of impaired loans [Abstract]
Total non-accrual loans, specific reserves	209,000			209,000			255,000
Residential real estate [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	267,000			267,000			562,000
60-89 Days Past Due	419,000			419,000			486,000
Accruing 90+Days	0			0			0
Total non-accrual LHFI, loan balance	520,000			520,000			994,000
Current	23,624,000			23,624,000			22,939,000
Subtotal LHFI							24,981,000
Total loans and leases	24,830,000			24,830,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	520,000			520,000			994,000
Total non-accrual LHFI, Specific reserves	16,000			16,000			14,000
Non-accrual loans held for sale [Abstract]
Total non-accrual loans, specific reserves	16,000			16,000			14,000
Summary of impaired loans [Abstract]
Total non-accrual loans, specific reserves	16,000			16,000			14,000
Multi Family [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	0			0			0
60-89 Days Past Due	0			0			0
Accruing 90+Days	0			0			0
Total non-accrual LHFI, loan balance	0			0			0
Current	11,678,000			11,678,000			11,756,000
Subtotal LHFI	11,678,000			11,678,000			11,756,000
Total loans and leases	11,678,000			11,678,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	0			0			0
Leases [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	162,000			162,000			325,000
60-89 Days Past Due	0			0			16,000
Accruing 90+Days	0			0			0
Total non-accrual LHFI, loan balance	385,000			385,000			251,000
Current	39,861,000			39,861,000			36,755,000
Subtotal LHFI	40,408,000			40,408,000			37,347,000
Total loans and leases	40,408,000			40,408,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	385,000			385,000			251,000
Total non-accrual LHFI, Specific reserves	138,000			138,000			55,000
Non-accrual loans held for sale [Abstract]
Total non-accrual loans, specific reserves	138,000			138,000			55,000
Summary of impaired loans [Abstract]
Total non-accrual loans, specific reserves	138,000			138,000			55,000
Tax Certificates [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	0			0			0
60-89 Days Past Due	0			0			0
Accruing 90+Days	0			0			0
Total non-accrual LHFI, loan balance	532,000			532,000			601,000
Current	14,832,000			14,832,000			23,968,000
Subtotal LHFI	15,364,000			15,364,000			24,569,000
Total loans and leases	15,364,000			15,364,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	532,000			532,000			601,000
Total non-accrual LHFI, Specific reserves	67,000			67,000			47,000
Non-accrual loans held for sale [Abstract]
Total non-accrual loans, specific reserves	67,000			67,000			47,000
Summary of impaired loans [Abstract]
Total non-accrual loans, specific reserves	67,000			67,000			47,000
Consumer [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	19,000			19,000			0
60-89 Days Past Due	0			0			0
Accruing 90+Days	0			0			0
Total non-accrual LHFI, loan balance	0			0			0
Current	812,000			812,000			1,139,000
Subtotal LHFI	831,000			831,000			1,139,000
Total loans and leases	831,000			831,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	$ 0			$ 0			$ 0

[1] For the 2013 period net deferred fees were allocated among the loan types.