Investment Securities Held-to-maturity Securities with Unrealized Loss (Details) $ in Thousands	Dec. 31, 2015 USD ($) securities	Dec. 31, 2014 USD ($) securities
Schedule of Held-to-maturity Securities
Fair value of securities in unrealized loss position less than 12 months	$ 4,246	$ 0
Unrealized loss less than 12 months	$ 93	$ 0
Number of securities at an unrealized loss position less than 12 months | securities	3	0
Fair value of securities in unrealized loss more than 12 months	$ 16,254	$ 24,921
Unrealized loss more than 12 months	$ 539	$ 672
Number of securities at an unrealized loss position more than 12 months | securities	4	7
Total fair value	$ 20,500	$ 24,921
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	632	672
States and political subdivisions
Schedule of Held-to-maturity Securities
Fair value of securities in unrealized loss position less than 12 months	0	0
Unrealized loss less than 12 months	$ 0	$ 0
Number of securities at an unrealized loss position less than 12 months | securities	0	0
Fair value of securities in unrealized loss more than 12 months	$ 319	$ 323
Unrealized loss more than 12 months	$ 4	$ 7
Number of securities at an unrealized loss position more than 12 months | securities	1	1
Total fair value	$ 319	$ 323
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	4	7
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities
Fair value of securities in unrealized loss position less than 12 months	3,706	0
Unrealized loss less than 12 months	$ 89	$ 0
Number of securities at an unrealized loss position less than 12 months | securities	2	0
Fair value of securities in unrealized loss more than 12 months	$ 10,040	$ 18,242
Unrealized loss more than 12 months	$ 445	$ 394
Number of securities at an unrealized loss position more than 12 months | securities	2	5
Total fair value	$ 13,746	$ 18,242
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	534	394
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities
Fair value of securities in unrealized loss position less than 12 months	540	0
Unrealized loss less than 12 months	$ 4	$ 0
Number of securities at an unrealized loss position less than 12 months | securities	1	0
Fair value of securities in unrealized loss more than 12 months	$ 5,895	$ 6,356
Unrealized loss more than 12 months	$ 90	$ 271
Number of securities at an unrealized loss position more than 12 months | securities	1	1
Total fair value	$ 6,435	$ 6,356
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	$ 94	$ 271