Fair Value Measurements (Details 5) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Financial Instruments, Financial Assets, Balance Sheet Groupings
Available-for-sale Securities, Fair Value Disclosure	$ 242,576		$ 341,539
Accrued Interest Receivable	11,675		11,363
FDIC Indemnification Asset	38,166	42,476	53,519	72,483	73,521	91,851
Bank Owned Life Insurance	71,956		70,756
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Time Deposits	999,552		1,159,615
Short-term Debt	112,105		32,382
Long-term Debt	115,592		88,173
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings
Cash and Cash Equivalents, Fair Value Disclosure	83,443		234,071
Available-for-sale Securities, Fair Value Disclosure	242,576		341,539
Held-to-maturity Securities, Fair Value Disclosure	223,503		114,805
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	9,780		7,604
Loans Held-for-sale, Fair Value Disclosure	39,954		57,414
Loans Receivable, Fair Value Disclosure	2,016,082		1,994,966
Accrued Interest Receivable	11,675		11,363
FDIC Indemnification Asset	38,166		53,519
Bank Owned Life Insurance	71,956		70,756
Interest rate cap derivative	10		40
Interest Rate Swap	2,967
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Demand deposits and savings	1,428,763		1,496,694
Time Deposits	999,552		1,159,615
Short-term Debt	112,105		32,382
Long-term Debt	115,592		88,173
Accrued Interest Payable	1,803		2,158
Estimated Fair Value [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings
Cash and Cash Equivalents, Fair Value Disclosure	83,443		234,071
Available-for-sale Securities, Fair Value Disclosure	242,576		341,539
Held-to-maturity Securities, Fair Value Disclosure	216,625		118,235
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	9,780		7,604
Loans Held-for-sale, Fair Value Disclosure	39,954		57,414
Loans Receivable, Fair Value Disclosure	2,075,634		1,976,745
Accrued Interest Receivable	11,675		11,363
FDIC Indemnification Asset	38,166		53,519
Bank Owned Life Insurance	71,956		70,756
Interest rate cap derivative	10		40
Interest Rate Swap	2,967
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Demand deposits and savings	1,428,763		1,496,694
Time Deposits	1,012,669		1,170,560
Short-term Debt	112,105		32,382
Long-term Debt	109,571		83,292
Accrued Interest Payable	1,803		2,158
Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings
Cash and Cash Equivalents, Fair Value Disclosure	83,443		234,071
Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings
Available-for-sale Securities, Fair Value Disclosure	242,576		341,539
Held-to-maturity Securities, Fair Value Disclosure	216,625		118,235
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	9,780		7,604
Loans Held-for-sale, Fair Value Disclosure	39,954		57,414
Loans Receivable, Fair Value Disclosure	1,814,523		1,686,660
Accrued Interest Receivable	11,675		11,363
Bank Owned Life Insurance	71,956		70,756
Interest rate cap derivative	10		40
Interest Rate Swap	2,967
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Demand deposits and savings	1,428,763		1,496,694
Time Deposits	1,012,669		1,170,560
Short-term Debt	112,105		32,382
Long-term Debt	109,571		83,292
Accrued Interest Payable	1,803		2,158
Fair Value, Inputs, Level 3 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings
Loans Receivable, Fair Value Disclosure	261,111		290,085
FDIC Indemnification Asset	$ 38,166		$ 53,519