Fair Value Measurements and Fair Value of Financial Instruments (Details) - Schedule of fair value hierarchy - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Financial assets
Cash and cash equivalents, Carrying Amount	$ 125,483	$ 126,847	$ 992,617	$ 82,692
Cash and cash equivalents, Fair Value	125,483	126,847
Investment securities available-for-sale, Carrying Amount	264,098	289,532
Investment securities: available-for-sale, Fair Value	264,098	289,532
Investment securities held-to-maturity, Carrying Amount	232,557	224,682
Investment securities held-to-maturity, Fair Value	237,205	231,445
Restricted investment in bank stocks, Carrying Amount	$ 27,078	$ 23,535
Restricted investment in bank stocks, Fair Value
Loans held for sale	$ 124
Loans held for sale	124
Net loans, Carrying Amount	2,747,808	$ 2,524,481
Net loans, Fair Value	2,734,082	2,538,415
Derivatives		48
Derivatives		48
Accrued interest receivable, Carrying Amount	12,055	11,700
Accrued interest receivable, Fair Value	12,055	11,700
Financial liabilities
Noninterest-bearing deposits, Carrying Amount	558,388	492,515
Noninterest-bearing deposits, Fair Value	553,008	492,515
Interest-bearing deposits, Carrying Amount	2,010,843	1,983,092
Interest-bearing deposits, Fair Value	2,019,036	1,990,484
Borrowings, Carrying Amount	548,758	495,553
Borrowings, Fair Value	552,752	505,641
Subordinated debentures, Carrying Amount	55,155	5,155
Subordinated debentures, Fair Value	54,944	4,768
Derivatives	250
Derivatives	250
Accrued interest payable, Carrying Amount	4,428	3,930
Accrued interest payable, Fair Value	4,428	3,930
Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and cash equivalents, Fair Value	125,483	126,847
Investment securities: available-for-sale, Fair Value	14,070	13,199
Investment securities held-to-maturity, Fair Value	$ 29,016	$ 29,184
Restricted investment in bank stocks, Fair Value
Accrued interest receivable, Fair Value	$ 67	$ 68
Financial liabilities
Noninterest-bearing deposits, Fair Value	553,008	492,515
Fair Value, Inputs, Level 2 [Member]
Financial assets
Investment securities: available-for-sale, Fair Value	250,028	276,333
Investment securities held-to-maturity, Fair Value	$ 189,523	$ 183,489
Restricted investment in bank stocks, Fair Value
Loans held for sale	$ 124
Derivatives		$ 48
Accrued interest receivable, Fair Value	3,458	3,674
Financial liabilities
Interest-bearing deposits, Fair Value	2,019,036	1,990,484
Borrowings, Fair Value	552,752	505,641
Subordinated debentures, Fair Value	54,944	4,768
Derivatives	250
Accrued interest payable, Fair Value	4,428	3,930
Fair Value, Inputs, Level 3 [Member]
Financial assets
Investment securities held-to-maturity, Fair Value	$ 18,666	$ 18,772
Restricted investment in bank stocks, Fair Value
Net loans, Fair Value	$ 2,734,082	$ 2,538,415
Accrued interest receivable, Fair Value	$ 8,530	$ 7,958