Investment Securities (Investments Classified by Maturity Date) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Due in one year or less, amortized cost	$ 9,690
Investment Securities Available-for-Sale: Due in one year or less, fair value	9,719
Investment Securities Available-for-Sale: Due after one year through five years, amortized cost	79,871
Investment Securities Available-for-Sale: Due after on eyear through five years, fair value	82,131
Investment Securities Available-for-Sale: Due after five years through ten years, amortized cost	180,124
Investment Securities Available-for-Sale: Dur after five years through ten years, fair value	179,657
Investment Securities Available-for-Sale: Due after ten years, amortized cost	74,640
Investment Securities Available-for-Sale: Due after ten years, fair value	74,506
Investment Securities Available-for-Sale: Total, amortized cost	410,805
Investment securities: Available-for-sale	413,147	496,815
Investment Securities Held-to-Maturity: Due after one year through five years, amortized cost	13,962
Investment Securities Held-to-Maturity: Due after one year through five years, fair value	14,041
Investment Securities Held-to-Maturity: Due after five years through ten years, amortized cost	10,274
Investment Securities Held-to-Maturity: Due after five years through ten years, fair value	10,353
Investment Securities Held-to-Maturity: Due after ten years, amortized cost	124,460
Investment Securities Held-to-Maturity: Due after ten years, fair value	122,859
Investment Securities Held-to-Maturity: Total, amortized cost	153,486	58,064
Investment Securities Held-to-Maturity: Fair Value	152,008	62,431
Investment Securities: Amortized Cost	564,291
Investment Securities: Fair Value	565,155
Residential mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: amortized cost	50,070
Investment Securities Available-for-Sale: fair value	50,942
Investment securities: Available-for-sale	50,942	53,784
Commercial mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: amortized cost	9,700
Investment Securities Available-for-Sale: fair value	9,518
Investment securities: Available-for-sale	9,518	9,969
Investment Securities Held-to-Maturity: amoritzed cost	4,790
Investment Securities Held-to-Maturity: fair value	4,755
Investment Securities Held-to-Maturity: Fair Value	4,755	5,650
Equity securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: amortized cost	376
Investment Securities Available-for-Sale: fair value	287
Investment securities: Available-for-sale	287	325
Mutual funds and money market funds [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: amortized cost	6,334
Investment Securities Available-for-Sale: fair value	6,387
Investment securities: Available-for-sale	$ 6,387	$ 9,198