Fair Value Measurements and Fair Value of Financial Instruments (Details) - Schedule of Fair Value Hierarchy (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Financial assets:
Cash and cash equivalents, Carrying Amount	$ 138,013	$ 82,692	$ 33,557	$ 106,138
Cash and cash equivalents, Fair Value	138,013	82,692
Investment securities available-for-sale, Carrying Amount	307,502	323,070
Investment securities: available-for-sale, Fair Value	307,502	323,070
Investment securities held-to-maturity, Carrying Amount	217,567	215,286
Investment securities held-to-maturity, Fair Value	222,393	210,958
Investment in restricted stock, at cost, Carrying Amount	17,922	8,986
Investment in restricted stock, at cost, Fair Value
Net loans, Carrying Amount	2,414,647	950,610
Net loans, Fair Value	2,427,263	948,606
Accrued interest receivable, Carrying Amount	10,976	6,802
Accrued interest receivable, Fair Value	10,976	6,802
Financial liabilities:
Noninterest-bearing deposits, Carrying Amount	471,151	227,370
Noninterest-bearing deposits, Fair Value	471,151	227,370
Interest-bearing deposits, Carrying Amount	1,998,017	1,114,635
Interest-bearing deposits, Fair Value	2,004,084	1,115,781
Borrowings, Carrying Amount	420,960	146,000
Borrowings, Fair Value	436,366	157,440
Subordinated debentures, Carrying Amount	5,155	5,155
Subordinated debentures, Fair Value	4,786	5,143
Accrued interest payable, Carrying Amount	3,811	963
Accrued interest payable, Fair Value	3,811	963
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents, Fair Value	138,013	82,692
Investment securities: available-for-sale, Fair Value	27,343	19,530
Investment securities held-to-maturity, Fair Value	28,463	27,037
Investment in restricted stock, at cost, Fair Value
Accrued interest receivable, Fair Value	278	102
Financial liabilities:
Noninterest-bearing deposits, Fair Value	471,151	227,370
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Investment securities: available-for-sale, Fair Value	280,159	303,540
Investment securities held-to-maturity, Fair Value	175,105	164,940
Investment in restricted stock, at cost, Fair Value
Accrued interest receivable, Fair Value	3,176	4,034
Financial liabilities:
Interest-bearing deposits, Fair Value	2,004,084	1,115,781
Borrowings, Fair Value	436,366	157,440
Subordinated debentures, Fair Value	4,786	5,143
Accrued interest payable, Fair Value	3,811	963
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Investment securities held-to-maturity, Fair Value	18,825	18,981
Investment in restricted stock, at cost, Fair Value
Net loans, Fair Value	2,427,263	948,606
Accrued interest receivable, Fair Value	$ 7,522	$ 2,666