Fair Value Measurements Not Measured at Fair Value on a Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Reported Value Measurement, Fair Value Disclosure [Member]	Dec. 31, 2013 Reported Value Measurement, Fair Value Disclosure [Member]	Jun. 30, 2014 Portion at Fair Value Measurement, Fair Value Disclosure [Member]	Dec. 31, 2013 Portion at Fair Value Measurement, Fair Value Disclosure [Member]	Jun. 30, 2014 Fair Value, Inputs, Level 1 [Member] Portion at Fair Value Measurement, Fair Value Disclosure [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Portion at Fair Value Measurement, Fair Value Disclosure [Member]	Jun. 30, 2014 Fair Value, Inputs, Level 2 [Member] Portion at Fair Value Measurement, Fair Value Disclosure [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Portion at Fair Value Measurement, Fair Value Disclosure [Member]	Jun. 30, 2014 Fair Value, Inputs, Level 3 [Member] Portion at Fair Value Measurement, Fair Value Disclosure [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Portion at Fair Value Measurement, Fair Value Disclosure [Member]	Jun. 30, 2014 Fair Value, Measurements, Nonrecurring [Member]		Jun. 30, 2013 Fair Value, Measurements, Nonrecurring [Member]		Jun. 30, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member]		Jun. 30, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member]		Jun. 30, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]		Jun. 30, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]		Jun. 30, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]		Jun. 30, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			$ 139,181	$ 191,881	$ 139,181	$ 191,881	$ 139,181	$ 191,881	$ 0	$ 0	$ 0	$ 0
Held-to-maturity Securities, Fair Value	139,679	110,917	138,380	112,014	139,679	110,917	0	0	139,679	110,917	0	0
Loans Receivable, Fair Value Disclosure			5,031,504	5,036,088	4,976,329	4,985,555	0	0	0	0	4,976,329	4,985,555	4,052	[1]	7,178	[2]	0	[1]	0	[2]	0	[1]	0	[2]	4,052	[1]	7,178	[2]
Loans Held-for-sale, Fair Value Disclosure			2,841	6,123	2,908	6,130	0	0	2,908	6,130	0	0
Other Assets, Fair Value Disclosure			114,756	117,840	114,756	117,840	0	0	114,756	117,840	0	0
Deposits, Fair Value Disclosure			4,951,852	5,110,370	4,948,957	5,113,224	0	0	4,948,957	5,113,224	0	0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure			137,334	102,353	137,319	102,343	0	0	137,319	102,343	0	0
Federal Home Loan Bank Borrowings, Fair Value Disclosure			416,579	367,254	426,250	377,384	0	0	426,250	377,384	0	0
Subordinated Debt Obligations, Fair Value Disclosure			106,363	106,363	96,363	96,363	0	0	0	0	96,363	96,363
Other Liabilities, Fair Value Disclosure			$ 7,483	$ 9,789	$ 7,483	$ 9,789	$ 0	$ 0	$ 7,483	$ 9,789	$ 0	$ 0

[1] Collateral-dependent impaired loan held at June 30, 2014 that had write-downs in fair value or whose specific reserve changed during the first six months of 2014.

[2] Collateral-dependent impaired loans held at June 30, 2013 that had write-downs in fair value or whose specific reserve changed during the first six months of 2013.