Fair Value Measurements (Carrying Value and Fair Value of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financial Assets:
Investment securities held to maturity	$ 36,874	$ 36,340
Financial Liabilities:
Certificate of deposit accounts	525,397
Level 1
Financial Assets:
Cash and cash equivalents	121,636	130,400
Other interest earning deposits	0	0
Investment securities available for sale	1,973	0
Investment securities held to maturity	0	0
Loans held for sale	0
Loans receivable, net of allowance for loan losses	0	0
Accrued interest receivable	3	26
Financial Liabilities:
Noninterest deposits, NOW accounts, money market accounts and savings accounts	2,380,934	1,089,759
Certificate of deposit accounts	0	0
Total deposits	2,380,934	1,089,759
Securities sold under agreement to repurchase	32,181	29,420
Junior subordinated debentures	0
Accrued interest payable	62	17
Level 2
Financial Assets:
Cash and cash equivalents	0	0
Other interest earning deposits	10,145	15,747
Investment securities available for sale	740,873	163,134
Investment securities held to maturity	36,874	36,340
Loans held for sale	5,710
Loans receivable, net of allowance for loan losses	0	0
Accrued interest receivable	3,009	910
Financial Liabilities:
Noninterest deposits, NOW accounts, money market accounts and savings accounts	0	0
Certificate of deposit accounts	525,768	311,065
Total deposits	525,768	311,065
Securities sold under agreement to repurchase	0	0
Junior subordinated debentures	0
Accrued interest payable	328	135
Level 3
Financial Assets:
Cash and cash equivalents	0	0
Other interest earning deposits	0	0
Investment securities available for sale	0	0
Investment securities held to maturity	0	0
Loans held for sale	0
Loans receivable, net of allowance for loan losses	2,279,081	1,218,192
Accrued interest receivable	6,824	4,526
Financial Liabilities:
Noninterest deposits, NOW accounts, money market accounts and savings accounts	0	0
Certificate of deposit accounts	0	0
Total deposits	0	0
Securities sold under agreement to repurchase	0	0
Junior subordinated debentures	19,082
Accrued interest payable	21	0
Carrying Value
Financial Assets:
Cash and cash equivalents	121,636	130,400
Other interest earning deposits	10,126	15,662
Investment securities available for sale	742,846	163,134
Investment securities held to maturity	35,814	36,154
Federal Home Loan Bank stock	12,188	5,741
Loans held for sale	5,582
Loans receivable, net of allowance for loan losses	2,223,348	1,203,096
Accrued interest receivable	9,836	5,462
Financial Liabilities:
Noninterest deposits, NOW accounts, money market accounts and savings accounts	2,380,934	1,089,759
Certificate of deposit accounts	525,397	309,430
Total deposits	2,906,331	1,399,189
Securities sold under agreement to repurchase	32,181	29,420
Junior subordinated debentures	19,082
Accrued interest payable	411	152
Fair Value
Financial Assets:
Cash and cash equivalents	121,636	130,400
Other interest earning deposits	10,145	15,747
Investment securities available for sale	742,846	163,134
Investment securities held to maturity	36,874	36,340
Loans held for sale	5,710
Loans receivable, net of allowance for loan losses	2,279,081	1,218,192
Accrued interest receivable	9,836	5,462
Financial Liabilities:
Noninterest deposits, NOW accounts, money market accounts and savings accounts	2,380,934	1,089,759
Certificate of deposit accounts	525,768	311,065
Total deposits	2,906,702	1,400,824
Securities sold under agreement to repurchase	32,181	29,420
Junior subordinated debentures	19,082
Accrued interest payable	$ 411	$ 152