Summary of Accounting Policies (Details) (USD $)	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		Nov. 29, 2012
Investment Securities [Abstract]
Other than temporary impairment on securities available-for-sale																	$ 202,000	[1]	$ 75,000	[1]	$ 135,000	[1]
Loans and Allowance for Loan and Lease Losses [Abstract]
Number of missing loans payment to consider 90 days delinquent and still accruing																	4
Number of missing loans payment to consider 30 to 59 day delinquencies																	2
Number of missing loans payment to consider 60 to 89 day delinquencies																	3
Loans available for sale	11,300,000								0								11,300,000		0
Internal Use Software [Abstract]
Amortization expenses during the period																	1,001,000		1,001,000		1,001,000
Other Identifiable Intangible Assets [Abstract]
Acquired software and personnel of a prepaid program manager																							1,800,000
Other Real Estate Owned [Abstract]
Other real estate owned	4,241,000								7,405,000								4,241,000		7,405,000
Income (numerator) [Abstract]
Basic earnings per share, Net income (Loss) available to common shareholders	5,237,000		3,561,000		3,854,000		3,972,000		3,288,000		2,282,000		660,000		2,688,000		16,624,000		8,918,000		(1,020,000)
Effect of dilutive securities, Common stock options and warrants																	0		0		0
Diluted earnings per share, Net income (loss) available to common shareholders																	16,624,000		8,918,000		(1,020,000)
Shares (denominator) [Abstract]
Basic earnings per share, Net income available to common shareholders (in shares)																	33,227,755		31,914,955		26,181,281
Effect of dilutive securities, Common stock options and Warrants (in shares)																	60,523		5,777		0
Diluted earnings per share, Net income available to common shareholders (in shares)																	33,288,278		31,920,732		26,181,281
Per share amount [Abstract]
Basic earnings per share, Net income available to common shareholders (in dollars per share)	$ 0.15	[2]	$ 0.11	[2]	$ 0.12	[2]	$ 0.12	[2]	$ 0.10	[2]	$ 0.07	[2]	$ 0.02	[2]	$ 0.10	[2]	$ 0.50		$ 0.28		$ (0.04)
Effect of dilutive securities, Common stock options and warrants (in dollars per share)																	$ 0		$ 0		$ 0
Diluted earnings per share, Net income available to common shareholders (in dollars per share)	$ 0.15	[2]	$ 0.11	[2]	$ 0.12	[2]	$ 0.12	[2]	$ 0.10	[2]	$ 0.07	[2]	$ 0.02	[2]	$ 0.10	[2]	$ 0.50		$ 0.28		$ (0.04)
Minimum exercisable prices (in dollars per share)																	$ 7.36		$ 7.36		$ 7.81
Maximum exercisable prices (in dollars per share)																	$ 25.43		$ 25.43		$ 25.43
Other comprehensive income (loss) [Abstract]
Change in net unrealized gain/loss during the period																	6,198,000		14,198,000		(1,392,000)
Reclassification adjustments for (gains) losses included in income																	(661,000)		(759,000)		(1,207,000)
Reclassification adjustment for called security																	297,000		(846,000)		0
Amortization of losses previously held as available for sale																	30,000		12,000		48,000
Other comprehensive income (loss)																	5,864,000		12,605,000		(2,551,000)
Deferred tax expense [Abstract]
Change in net unrealized gain/loss during the period																	2,169,000		4,969,000		(473,000)
Reclassification adjustments for (gains) losses included in income																	(232,000)		(265,000)		(410,000)
Reclassification adjustment for called security																	104,000		(296,000)		0
Reclassification adjustments tax rate adjustment																	0		(27,000)		18,000
Amortization of losses previously held as available for sale																	11,000		4,000		16,000
Deferred tax expense																	2,052,000		4,385,000		(849,000)
Other comprehensive income(loss), after tax and net of reclassifications into net income																	3,812,000		8,220,000		(1,702,000)
Restrictions on Cash and Due from Banks [Abstract]
Restricted Cash and Cash Equivalents	181,300,000								96,200,000								181,300,000		96,200,000
Cash pledged as collateral	25,000,000								0								25,000,000		0
Segment Reporting [Abstract]
Number of Reportable Segments																	1		1		1
Common Stock Repurchase Program [Abstract]
Number of stock repurchased under, Stock repurchase program (in shares)	100,000								100,000								100,000		100,000
Maximum number of shares authorized (in shares)									750,000										750,000
Purchase of treasury shares (in shares)																			100,000
Average cost of repurchased stock (in dollars per share)																			$ 8.66
Stock Options [Member]
Per share amount [Abstract]
Common stock options (in shares)																	2,401,493		2,705,115		2,244,864
Stock Appreciation Rights (SARs) [Member]
Per share amount [Abstract]
Common stock options (in shares)																			60,000		60,000
Internal Use Software [Member]
Internal Use Software [Abstract]
Total capitalized software costs	1,300,000								1,100,000								1,300,000		1,100,000
Amortization expenses during the period																	669,000		582,000		396,000
Internal Use Software [Member] | Maximum [Member]
Internal Use Software [Abstract]
Estimated useful life																	7 years
Other Identifiable Intangible Assets [Abstract]
Amortization period																	7 years
Internal Use Software [Member] | Minimum [Member]
Internal Use Software [Abstract]
Estimated useful life																	3 years
Other Identifiable Intangible Assets [Abstract]
Amortization period																	3 years
Customer Lists [Member]
Internal Use Software [Abstract]
Estimated useful life																	12 years
Other Identifiable Intangible Assets [Abstract]
Amortization period																	12 years
Amortization expenses per year	1,000,000																1,000,000
Amortization expense, year two	1,000,000																1,000,000
Amortization expense, year three	1,000,000																1,000,000
Amortization expense, year four	1,000,000																1,000,000
Amortization expense, year five	1,000,000																1,000,000
Amortization expense over the next five year	5,000,000																5,000,000
Gross Carrying amount	12,006,000								12,006,000								12,006,000		12,006,000
Accumulated Amortization	$ 5,003,000								$ 4,002,000								$ 5,003,000		$ 4,002,000

[1] Other-than-temporary impairment was due to credit loss and therefore did not include amounts due to market conditions.

[2] May not equal annual amounts due to rounding,