Investment Securities (Investments Classified by Maturity Date) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Due in one year or less, amortized cost	$ 13,077
Investment Securities Available-for-Sale: Due in one year or less, fair value	13,117
Investment Securities Available-for-Sale: Due after one year through five years, amortized cost	88,313
Investment Securities Available-for-Sale: Due after on eyear through five years, fair value	90,533
Investment Securities Available-for-Sale: Due after five years through ten years, amortized cost	178,029
Investment Securities Available-for-Sale: Dur after five years through ten years, fair value	178,033
Investment Securities Available-for-Sale: Due after ten years, amortized cost	74,960
Investment Securities Available-for-Sale: Due after ten years, fair value	74,894
Investment Securities Available-for-Sale: Total, amortized cost	417,470
Investment securities: Available-for-sale	419,773	496,815
Investment Securities Held-to-Maturity: Due after one year through five years, amortized cost	13,978
Investment Securities Held-to-Maturity: Due after one year through five years, fair value	13,864
Investment Securities Held-to-Maturity: Due after five years through ten years, amortized cost	9,531
Investment Securities Held-to-Maturity: Due after five years through ten years, fair value	9,592
Investment Securities Held-to-Maturity: Due after ten years, amortized cost	108,312
Investment Securities Held-to-Maturity: Due after ten years, fair value	107,031
Investment Securities Held-to-Maturity: Total, amortized cost	136,786	58,064
Investment Securities Held-to-Maturity: Total, fair value	135,354	62,431
Investment Securities: Amortized Cost	554,256
Investment Securities: Fair Value	555,127
Residential mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: amortized cost	48,925
Investment Securities Available-for-Sale: fair value	49,386
Investment securities: Available-for-sale	49,386	53,784
Commercial mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: amortized cost	9,709
Investment Securities Available-for-Sale: fair value	9,421
Investment securities: Available-for-sale	9,421	9,969
Investment Securities Held-to-Maturity: amoritzed cost	4,965
Investment Securities Held-to-Maturity: fair value	4,867
Investment Securities Held-to-Maturity: Total, fair value	4,867	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	255
Investment securities: Available-for-sale	255	325
Other securities [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: amortized cost	4,081
Investment Securities Available-for-Sale: fair value	4,134
Investment securities: Available-for-sale	$ 4,134	$ 9,198