Investment Securities (Unrealized Gains) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	$ 281,447	$ 319,147
Investment Securities Available-for-Sale: Unrealized Gains	7,727	6,960
Investment Securities Available-for-Sale: Unrealized Losses	(1,703)	(3,037)
Investment securities: Available-for-sale, Fair Value	287,471	323,070
Investment Securities Held-to-Maturity: Amortized Cost	214,191	215,286
Investment Securities Held-to-Maturity: Unrealized Gains	2,964	1,516
Investment Securities Held-to-Maturity: Unrealized Losses	(2,203)	(5,844)
Investment Securities Held-to-Maturity: Fair Value	214,952	210,958
Total investment securities, amortized cost	495,638	534,433
Total investment securities, gross unrealized gains	10,691	8,476
Total investment securities, gross unrealized losses	(3,906)	(8,881)
Total investment securities, fair value	502,423	534,028
U.S. treasury notes [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	14,361	14,344
Investment Securities Available-for-Sale: Unrealized Gains	0	0
Investment Securities Available-for-Sale: Unrealized Losses	(465)	(825)
Investment securities: Available-for-sale, Fair Value	13,896	13,519
Investment Securities Held-to-Maturity: Amortized Cost	28,108	28,056
Investment Securities Held-to-Maturity: Unrealized Gains	0	0
Investment Securities Held-to-Maturity: Unrealized Losses	(315)	(1,019)
Investment Securities Held-to-Maturity: Fair Value	27,793	27,037
Federal agency obligations [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	23,381	20,567
Investment Securities Available-for-Sale: Unrealized Gains	23	29
Investment Securities Available-for-Sale: Unrealized Losses	(314)	(655)
Investment securities: Available-for-sale, Fair Value	23,090	19,941
Investment Securities Held-to-Maturity: Amortized Cost	14,521	15,249
Investment Securities Held-to-Maturity: Unrealized Gains	106	23
Investment Securities Held-to-Maturity: Unrealized Losses	(71)	(389)
Investment Securities Held-to-Maturity: Fair Value	14,556	14,883
Residential mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	46,354	48,312
Investment Securities Available-for-Sale: Unrealized Gains	936	791
Investment Securities Available-for-Sale: Unrealized Losses	(102)	(229)
Investment securities: Available-for-sale, Fair Value	47,188	48,874
Investment Securities Held-to-Maturity: Amortized Cost	2,160	2,246
Investment Securities Held-to-Maturity: Unrealized Gains	0	0
Investment Securities Held-to-Maturity: Unrealized Losses	(35)	(64)
Investment Securities Held-to-Maturity: Fair Value	2,125	2,182
Commercial mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	3,079	7,145
Investment Securities Available-for-Sale: Unrealized Gains	0	3
Investment Securities Available-for-Sale: Unrealized Losses	(116)	(157)
Investment securities: Available-for-sale, Fair Value	2,963	6,991
Investment Securities Held-to-Maturity: Amortized Cost	4,379	4,417
Investment Securities Held-to-Maturity: Unrealized Gains	59	41
Investment Securities Held-to-Maturity: Unrealized Losses	(39)	(62)
Investment Securities Held-to-Maturity: Fair Value	4,399	4,396
Obligations of U.S. states and political subdivisions [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	14,353	30,804
Investment Securities Available-for-Sale: Unrealized Gains	586	711
Investment Securities Available-for-Sale: Unrealized Losses	0	(55)
Investment securities: Available-for-sale, Fair Value	14,939	31,460
Investment Securities Held-to-Maturity: Amortized Cost	127,111	127,418
Investment Securities Held-to-Maturity: Unrealized Gains	2,389	1,303
Investment Securities Held-to-Maturity: Unrealized Losses	(1,685)	(3,688)
Investment Securities Held-to-Maturity: Fair Value	127,815	125,033
Trust preferred securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	19,764	19,763
Investment Securities Available-for-Sale: Unrealized Gains	329	150
Investment Securities Available-for-Sale: Unrealized Losses	(296)	(510)
Investment securities: Available-for-sale, Fair Value	19,797	19,403
Corporate bonds and notes [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	136,152	154,182
Investment Securities Available-for-Sale: Unrealized Gains	5,647	4,930
Investment Securities Available-for-Sale: Unrealized Losses	(148)	(482)
Investment securities: Available-for-sale, Fair Value	141,651	158,630
Investment Securities Held-to-Maturity: Amortized Cost	37,912	37,900
Investment Securities Held-to-Maturity: Unrealized Gains	410	149
Investment Securities Held-to-Maturity: Unrealized Losses	(58)	(622)
Investment Securities Held-to-Maturity: Fair Value	38,264	37,427
Asset-backed securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	15,386	15,733
Investment Securities Available-for-Sale: Unrealized Gains	168	246
Investment Securities Available-for-Sale: Unrealized Losses	0	0
Investment securities: Available-for-sale, Fair Value	15,554	15,979
Certificates of Deposit [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	2,100	2,250
Investment Securities Available-for-Sale: Unrealized Gains	38	32
Investment Securities Available-for-Sale: Unrealized Losses	(9)	(20)
Investment securities: Available-for-sale, Fair Value	2,129	2,262
Equity securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	376	376
Investment Securities Available-for-Sale: Unrealized Gains	0	0
Investment Securities Available-for-Sale: Unrealized Losses	(84)	(89)
Investment securities: Available-for-sale, Fair Value	292	287
Mutual funds and money market funds [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Amortized cost	6,141	5,671
Investment Securities Available-for-Sale: Unrealized Gains	0	68
Investment Securities Available-for-Sale: Unrealized Losses	(169)	(15)
Investment securities: Available-for-sale, Fair Value	$ 5,972	$ 5,724