Fair Value Measurement for Financial and Non-Financial Assets and Liabilities (Details 5) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets:
Deposits held in other financial institutions	$ 21,006	$ 21,019
Investment securities available-for-sale	342,438	352,437
Investment securities held-to-maturity	34	37
FHLB stock	15,983	15,983
FDIC loss-share indemnification asset	2,169	4,856
Due from customer on acceptances	889	1,517
Liabilities:
Non-interest bearing deposits	869,598	832,152
Junior subordinated debentures	71,610	71,550
Long-term FHLB advances	150,292	190,325
Bank acceptances outstanding	889	1,517
Carrying Amount
Assets:
FHLB stock	15,983	15,983
Carrying Amount | Estimated Fair Value, Level 1
Assets:
Cash and cash equivalents	160,999	124,064
Federal funds sold	7,301	46,590
Deposits held in other financial institutions	21,006	21,019
Due from customer on acceptances	889	1,517
Liabilities:
Non-interest bearing deposits	869,598	832,152
Short-term FHLB advances	140,000	180,000
Accrued interest payable	2,462	2,418
Bank acceptances outstanding	889	1,517
Carrying Amount | Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available-for-sale	342,438	352,437
Investment securities held-to-maturity	32	35
Loans held-for-sale	27,791	47,557
Accrued interest receivable	8,293	8,350
Liabilities:
Interest-bearing deposits	2,053,611	2,039,358
Junior subordinated debentures	71,610	71,550
Long-term FHLB advances	10,292	10,325
Accrued interest payable	2,462	2,418
Carrying Amount | Estimated Fair Value, Level 3
Assets:
Loans receivable, net of allowance	2,818,175	2,763,279
Accrued interest receivable	8,293	8,350
FDIC loss-share indemnification asset	2,169	4,856
Estimated Fair Value | Estimated Fair Value, Level 1
Assets:
Cash and cash equivalents	160,999	124,064
Federal funds sold	7,301	46,590
Deposits held in other financial institutions	21,006	21,019
Due from customer on acceptances	889	1,517
Liabilities:
Non-interest bearing deposits	869,598	832,152
Short-term FHLB advances	140,000	180,000
Accrued interest payable	2,462	2,418
Bank acceptances outstanding	889	1,517
Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Assets:
Investment securities available-for-sale	342,438	352,437
Investment securities held-to-maturity	34	37
Loans held-for-sale	31,220	52,169
Accrued interest receivable	8,293	8,350
Liabilities:
Interest-bearing deposits	2,009,008	1,993,563
Junior subordinated debentures	65,717	66,186
Long-term FHLB advances	10,186	10,238
Accrued interest payable	2,462	2,418
Estimated Fair Value | Estimated Fair Value, Level 3
Assets:
Loans receivable, net of allowance	2,821,415	2,752,556
Accrued interest receivable	8,293	8,350
FDIC loss-share indemnification asset	$ 2,169	$ 4,856