Investment Securities (Held-to-maturity Securities with Unrealized Loss) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015 securities	Dec. 31, 2014 securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	$ 3,148	$ 0
Less than 12 months, unrealized loss	15	0
Less than 12 months, no. of securities	1	0
12 months or more, fair value	17,552	24,921
12 months or more, unrealized loss	244	672
12 months or more, no. of securities	4	7
Total fair value	20,700	24,921
Total unrealized loss	259	672
States and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	0	0
Less than 12 months, unrealized loss	0	0
Less than 12 months, no. of securities	0	0
12 months or more, fair value	324	323
12 months or more, unrealized loss	4	7
12 months or more, no. of securities	1	1
Total fair value	324	323
Total unrealized loss	4	7
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	3,148	0
Less than 12 months, unrealized loss	15	0
Less than 12 months, no. of securities	1	0
12 months or more, fair value	10,655	18,242
12 months or more, unrealized loss	218	394
12 months or more, no. of securities	2	5
Total fair value	13,803	18,242
Total unrealized loss	233	394
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	0	0
Less than 12 months, unrealized loss	0	0
Less than 12 months, no. of securities	0	0
12 months or more, fair value	6,573	6,356
12 months or more, unrealized loss	22	271
12 months or more, no. of securities	1	1
Total fair value	6,573	6,356
Total unrealized loss	$ 22	$ 271