Investment Securities (Held-to-maturity Securities with Unrealized Loss) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013 securities	Dec. 31, 2012 securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	$ 42,383	$ 2,398
Less than 12 months, unrealized loss	1,328	41
Less than 12 months, no. of securities	11	2
12 months or more, fair value	0	0
12 months or more, unrealized loss	0	0
12 months or more, no. of securities	0	0
Total fair value	42,383	2,398
Total unrealized loss	1,328	41
States and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	867
Less than 12 months, unrealized loss	15
Less than 12 months, no. of securities	2
12 months or more, fair value	0
12 months or more, unrealized loss	0
12 months or more, no. of securities	0
Total fair value	867
Total unrealized loss	15	0
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	34,860	2,398
Less than 12 months, unrealized loss	1,202	41
Less than 12 months, no. of securities	8	2
12 months or more, fair value	0	0
12 months or more, unrealized loss	0	0
12 months or more, no. of securities	0	0
Total fair value	34,860	2,398
Total unrealized loss	1,202	41
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	6,656	0
Less than 12 months, unrealized loss	111	0
Less than 12 months, no. of securities	1	0
12 months or more, fair value	0	0
12 months or more, unrealized loss	0	0
12 months or more, no. of securities	0	0
Total fair value	6,656	0
Total unrealized loss	$ 111	$ 0