Fair Value Measurements and Fair Value of Financial Instruments (Details) - Schedule of fair value hierarchy - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financial assets
Cash and due from banks, Carrying Amount	$ 149,582	$ 200,399	$ 200,895	$ 126,847
Cash and due from banks, Fair Value	149,582	200,399
Investment securities available-for-sale, Carrying Amount	435,284	353,290
Investment Securities Available-for-Sale, Fair Value	435,284	353,290
Restricted investment in bank stocks, Carrying Amount	33,497	24,310
Restricted investment in bank stocks, Fair Value
Loans held-for-sale, Carrying Amount	24,845	78,005
Loans held-for-sale, Fair Value	24,845	78,005
Net loans, Carrying Amount	4,139,708	3,450,088
Net loans, Fair Value	4,118,542	3,462,138
Derivatives, Carrying Amount	798	88
Derivatives, Fair Value	798	88
Accrued interest receivable, Carrying Amount	15,470	12,965
Accrued interest receivable, Fair Value	15,470	12,965
Financial liabilities
Noninterest-bearing deposits, Carrying Amount	776,843	694,977
Noninterest-bearing deposits, Fair Value	776,843	694,977
Interest-bearing deposits, Carrying Amount	3,018,285	2,649,294
Interest-bearing deposits, Fair Value	3,018,285	2,649,717
Borrowings, Carrying Amount	670,077	476,280
Borrowings, Fair Value	669,680	478,286
Subordinated debentures, Carrying Amount	54,699	54,534
Subordinated debentures, Fair Value	57,340	55,901
Accrued interest payable, Carrying Amount	3,707	4,142
Accrued interest payable, Fair Value	3,707	4,142
Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and due from banks, Fair Value	149,582	200,399
Investment Securities Available-for-Sale, Fair Value	15,150	14,982
Restricted investment in bank stocks, Carrying Amount
Restricted investment in bank stocks, Fair Value
Loans held-for-sale, Fair Value
Net loans, Fair Value
Derivatives, Carrying Amount
Derivatives, Fair Value
Accrued interest receivable, Fair Value
Financial liabilities
Noninterest-bearing deposits, Fair Value	776,843	694,977
Interest-bearing deposits, Fair Value	1,842,151	1,681,044
Borrowings, Fair Value
Subordinated debentures, Fair Value
Accrued interest payable, Fair Value
Fair Value, Inputs, Level 2 [Member]
Financial assets
Cash and due from banks, Fair Value
Investment Securities Available-for-Sale, Fair Value	410,502	320,090
Restricted investment in bank stocks, Carrying Amount
Restricted investment in bank stocks, Fair Value
Loans held-for-sale, Fair Value	370	12,409
Net loans, Fair Value
Derivatives, Carrying Amount	798	88
Derivatives, Fair Value	798	88
Accrued interest receivable, Fair Value	1,900	2,026
Financial liabilities
Noninterest-bearing deposits, Fair Value
Interest-bearing deposits, Fair Value	1,176,134	968,673
Borrowings, Fair Value	669,680	478,286
Subordinated debentures, Fair Value	57,340	55,901
Accrued interest payable, Fair Value	3,707	4,142
Fair Value, Inputs, Level 3 [Member]
Financial assets
Cash and due from banks, Fair Value
Investment Securities Available-for-Sale, Fair Value	9,632	18,218
Restricted investment in bank stocks, Carrying Amount
Restricted investment in bank stocks, Fair Value
Loans held-for-sale, Fair Value	24,475	65,596
Net loans, Fair Value	4,118,542	3,462,138
Derivatives, Carrying Amount
Derivatives, Fair Value
Accrued interest receivable, Fair Value	13,570	10,939
Financial liabilities
Noninterest-bearing deposits, Fair Value
Interest-bearing deposits, Fair Value
Borrowings, Fair Value
Subordinated debentures, Fair Value
Accrued interest payable, Fair Value