Investment Securities (Details) - Unrealized gains on investment securities (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Investment Securities (Details) - Unrealized gains on investment securities [Line Items]
Investment Securities Available-for-Sale, Amortized Cost	$ 299,867	$ 319,147
Investment Securities Available-for-Sale, Gross Unrealized Gains	8,580	6,960
Investment Securities Available-for-Sale, Gross Unrealized Losses	(945)	(3,037)
Investment Securities Available-for-Sale, Fair Value	307,502	323,070
Investment Securities Held-to-Maturity, Amortized Cost	217,567	215,286
Investment Securities Held-to-Maturity, Gross Unrealized Gains	5,084	1,516
Investment Securities Held-to-Maturity, Gross Unrealized Losses	(258)	(5,844)
Investment Securities Held-to-Maturity, Fair Value	222,393	210,958
Total, Amortized Cost	517,434	534,433
Total, Gross Unrealized Gains	13,664	8,476
Total, Gross Unrealized Losses	(1,203)	(8,881)
Total, Fair Value	529,895	534,028
US Treasury Securities [Member]
Investment Securities (Details) - Unrealized gains on investment securities [Line Items]
Investment Securities Available-for-Sale, Amortized Cost	11,517	14,344
Investment Securities Available-for-Sale, Gross Unrealized Losses	(132)	(825)
Investment Securities Available-for-Sale, Fair Value	11,385	13,519
Investment Securities Held-to-Maturity, Amortized Cost	28,212	28,056
Investment Securities Held-to-Maturity, Gross Unrealized Gains	251
Investment Securities Held-to-Maturity, Gross Unrealized Losses		(1,019)
Investment Securities Held-to-Maturity, Fair Value	28,463	27,037
Federal Agency Obligations [Member]
Investment Securities (Details) - Unrealized gains on investment securities [Line Items]
Investment Securities Available-for-Sale, Amortized Cost	33,110	20,567
Investment Securities Available-for-Sale, Gross Unrealized Gains	75	29
Investment Securities Available-for-Sale, Gross Unrealized Losses	(193)	(655)
Investment Securities Available-for-Sale, Fair Value	32,992	19,941
Investment Securities Held-to-Maturity, Amortized Cost	21,119	15,249
Investment Securities Held-to-Maturity, Gross Unrealized Gains	112	23
Investment Securities Held-to-Maturity, Gross Unrealized Losses	(74)	(389)
Investment Securities Held-to-Maturity, Fair Value	21,157	14,883
Residential Mortgage Backed Securities [Member]
Investment Securities (Details) - Unrealized gains on investment securities [Line Items]
Investment Securities Available-for-Sale, Amortized Cost	58,459	48,312
Investment Securities Available-for-Sale, Gross Unrealized Gains	1,332	791
Investment Securities Available-for-Sale, Gross Unrealized Losses	(100)	(229)
Investment Securities Available-for-Sale, Fair Value	59,691	48,874
Investment Securities Held-to-Maturity, Amortized Cost	2,616	2,246
Investment Securities Held-to-Maturity, Gross Unrealized Gains	7
Investment Securities Held-to-Maturity, Gross Unrealized Losses		(64)
Investment Securities Held-to-Maturity, Fair Value	2,623	2,182
Commercial Mortgage Backed Securities [Member]
Investment Securities (Details) - Unrealized gains on investment securities [Line Items]
Investment Securities Available-for-Sale, Amortized Cost	3,057	7,145
Investment Securities Available-for-Sale, Gross Unrealized Gains		3
Investment Securities Available-for-Sale, Gross Unrealized Losses	(41)	(157)
Investment Securities Available-for-Sale, Fair Value	3,016	6,991
Investment Securities Held-to-Maturity, Amortized Cost	4,304	4,417
Investment Securities Held-to-Maturity, Gross Unrealized Gains	38	41
Investment Securities Held-to-Maturity, Gross Unrealized Losses	(19)	(62)
Investment Securities Held-to-Maturity, Fair Value	4,323	4,396
US States and Political Subdivisions Debt Securities [Member]
Investment Securities (Details) - Unrealized gains on investment securities [Line Items]
Investment Securities Available-for-Sale, Amortized Cost	8,204	30,804
Investment Securities Available-for-Sale, Gross Unrealized Gains	225	711
Investment Securities Available-for-Sale, Gross Unrealized Losses		(55)
Investment Securities Available-for-Sale, Fair Value	8,429	31,460
Investment Securities Held-to-Maturity, Amortized Cost	123,379	127,418
Investment Securities Held-to-Maturity, Gross Unrealized Gains	3,914	1,303
Investment Securities Held-to-Maturity, Gross Unrealized Losses	(151)	(3,688)
Investment Securities Held-to-Maturity, Fair Value	127,142	125,033
Trust Preferred Securities [Member]
Investment Securities (Details) - Unrealized gains on investment securities [Line Items]
Investment Securities Available-for-Sale, Amortized Cost	16,085	19,763
Investment Securities Available-for-Sale, Gross Unrealized Gains	465	150
Investment Securities Available-for-Sale, Gross Unrealized Losses	(236)	(510)
Investment Securities Available-for-Sale, Fair Value	16,314	19,403
Corporate Bonds and Notes [Member]
Investment Securities (Details) - Unrealized gains on investment securities [Line Items]
Investment Securities Available-for-Sale, Amortized Cost	129,550	154,182
Investment Securities Available-for-Sale, Gross Unrealized Gains	6,300	4,930
Investment Securities Available-for-Sale, Gross Unrealized Losses	(10)	(482)
Investment Securities Available-for-Sale, Fair Value	135,840	158,630
Investment Securities Held-to-Maturity, Amortized Cost	37,937	37,900
Investment Securities Held-to-Maturity, Gross Unrealized Gains	762	149
Investment Securities Held-to-Maturity, Gross Unrealized Losses	(14)	(622)
Investment Securities Held-to-Maturity, Fair Value	38,685	37,427
Asset-backed Securities [Member]
Investment Securities (Details) - Unrealized gains on investment securities [Line Items]
Investment Securities Available-for-Sale, Amortized Cost	21,603	15,733
Investment Securities Available-for-Sale, Gross Unrealized Gains	151	246
Investment Securities Available-for-Sale, Gross Unrealized Losses	(1)
Investment Securities Available-for-Sale, Fair Value	21,753	15,979
Certificates of Deposit [Member]
Investment Securities (Details) - Unrealized gains on investment securities [Line Items]
Investment Securities Available-for-Sale, Amortized Cost	2,098	2,250
Investment Securities Available-for-Sale, Gross Unrealized Gains	32	32
Investment Securities Available-for-Sale, Gross Unrealized Losses	(6)	(20)
Investment Securities Available-for-Sale, Fair Value	2,124	2,262
Equity Securities [Member]
Investment Securities (Details) - Unrealized gains on investment securities [Line Items]
Investment Securities Available-for-Sale, Amortized Cost	376	376
Investment Securities Available-for-Sale, Gross Unrealized Losses	(87)	(89)
Investment Securities Available-for-Sale, Fair Value	289	287
Money Market Funds [Member]
Investment Securities (Details) - Unrealized gains on investment securities [Line Items]
Investment Securities Available-for-Sale, Amortized Cost	15,808	5,671
Investment Securities Available-for-Sale, Gross Unrealized Gains		68
Investment Securities Available-for-Sale, Gross Unrealized Losses	(139)	(15)
Investment Securities Available-for-Sale, Fair Value	$ 15,669	$ 5,724