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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended															3 Months Ended								12 Months Ended
	Nov. 11, 2014	Oct. 23, 2014	Jul. 24, 2014	Mar. 27, 2014	Jan. 29, 2014	Oct. 23, 2013	Jul. 23, 2013	Apr. 24, 2013	Jan. 30, 2013	Nov. 30, 2012	Oct. 30, 2012	Jul. 25, 2012	Jun. 26, 2012	Apr. 26, 2012	Feb. 01, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Interest income																$ 38,439	$ 35,031	$ 30,023	$ 17,613	$ 18,552	$ 18,533	$ 16,859	$ 17,484	$ 121,106	$ 71,428	$ 69,109
Interest expense																1,659us-gaap_InterestExpense	1,724us-gaap_InterestExpense	1,426us-gaap_InterestExpense	872us-gaap_InterestExpense	907us-gaap_InterestExpense	952us-gaap_InterestExpense	919us-gaap_InterestExpense	946us-gaap_InterestExpense	5,681us-gaap_InterestExpense	3,724us-gaap_InterestExpense	4,534us-gaap_InterestExpense
Net interest income																36,780us-gaap_InterestIncomeExpenseNet	33,307us-gaap_InterestIncomeExpenseNet	28,597us-gaap_InterestIncomeExpenseNet	16,741us-gaap_InterestIncomeExpenseNet	17,645us-gaap_InterestIncomeExpenseNet	17,581us-gaap_InterestIncomeExpenseNet	15,940us-gaap_InterestIncomeExpenseNet	16,538us-gaap_InterestIncomeExpenseNet	115,425us-gaap_InterestIncomeExpenseNet	67,704us-gaap_InterestIncomeExpenseNet	64,575us-gaap_InterestIncomeExpenseNet
Provision for loan losses																2,851us-gaap_ProvisionForLoanAndLeaseLosses	594us-gaap_ProvisionForLoanAndLeaseLosses	691us-gaap_ProvisionForLoanAndLeaseLosses	458us-gaap_ProvisionForLoanAndLeaseLosses	428us-gaap_ProvisionForLoanAndLeaseLosses	1,078us-gaap_ProvisionForLoanAndLeaseLosses	1,308us-gaap_ProvisionForLoanAndLeaseLosses	858us-gaap_ProvisionForLoanAndLeaseLosses	4,594us-gaap_ProvisionForLoanAndLeaseLosses	3,672us-gaap_ProvisionForLoanAndLeaseLosses	2,016us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses																33,929	32,713	27,906	16,283	17,217	16,503	14,632	15,680	110,831	64,032	62,559
Noninterest income																3,897us-gaap_NoninterestIncome	5,483us-gaap_NoninterestIncome	4,780us-gaap_NoninterestIncome	2,307us-gaap_NoninterestIncome	2,430us-gaap_NoninterestIncome	2,582us-gaap_NoninterestIncome	2,357us-gaap_NoninterestIncome	2,282us-gaap_NoninterestIncome	16,467us-gaap_NoninterestIncome	9,651us-gaap_NoninterestIncome	7,272us-gaap_NoninterestIncome
Noninterest expense																29,243us-gaap_NoninterestExpense	28,363us-gaap_NoninterestExpense	26,994us-gaap_NoninterestExpense	14,779us-gaap_NoninterestExpense	18,504us-gaap_NoninterestExpense	14,285us-gaap_NoninterestExpense	13,007us-gaap_NoninterestExpense	13,719us-gaap_NoninterestExpense	99,379us-gaap_NoninterestExpense	59,515us-gaap_NoninterestExpense	50,392us-gaap_NoninterestExpense
Income before income taxes																8,583	9,833	5,692	3,811	1,143	4,800	3,982	4,243	27,919	14,168	19,439
Income tax expense																1,328us-gaap_IncomeTaxExpenseBenefit	2,765us-gaap_IncomeTaxExpenseBenefit	1,544us-gaap_IncomeTaxExpenseBenefit	1,268us-gaap_IncomeTaxExpenseBenefit	433us-gaap_IncomeTaxExpenseBenefit	1,510us-gaap_IncomeTaxExpenseBenefit	1,292us-gaap_IncomeTaxExpenseBenefit	1,358us-gaap_IncomeTaxExpenseBenefit	6,905us-gaap_IncomeTaxExpenseBenefit	4,593us-gaap_IncomeTaxExpenseBenefit	6,178us-gaap_IncomeTaxExpenseBenefit
Net income																$ 7,255us-gaap_NetIncomeLoss	$ 7,068us-gaap_NetIncomeLoss	$ 4,148us-gaap_NetIncomeLoss	$ 2,543us-gaap_NetIncomeLoss	$ 710us-gaap_NetIncomeLoss	$ 3,290us-gaap_NetIncomeLoss	$ 2,690us-gaap_NetIncomeLoss	$ 2,885us-gaap_NetIncomeLoss	$ 21,014us-gaap_NetIncomeLoss	$ 9,575us-gaap_NetIncomeLoss	$ 13,261us-gaap_NetIncomeLoss
Basic earnings per common share (in usd per share)																$ 0.24us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.16us-gaap_EarningsPerShareBasic	$ 0.16us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic	$ 0.19us-gaap_EarningsPerShareBasic	$ 0.82us-gaap_EarningsPerShareBasic	$ 0.61us-gaap_EarningsPerShareBasic	$ 0.87us-gaap_EarningsPerShareBasic
Diluted earnings per common share (in usd per share)																$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.18us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted	$ 0.82us-gaap_EarningsPerShareDiluted	$ 0.61us-gaap_EarningsPerShareDiluted	$ 0.87us-gaap_EarningsPerShareDiluted
Cash dividends declared on common stock (in usd per share)	$ 0.16	$ 0.09	$ 0.09	$ 0.08	$ 0.08	$ 0.08	$ 0.18	$ 0.08	$ 0.08	$ 0.30	$ 0.08	$ 0.08	$ 0.20	$ 0.08	$ 0.06	$ 0.25	$ 0.09	$ 0	$ 0.16	$ 0.08	$ 0.18	$ 0.08	$ 0.08	$ 0.50	$ 0.42	$ 0.80