Fair Value of Financial Instruments Hierarchy Table - Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Investment securities available for sale:
Total securities available for sale	$ 280,434	$ 201,638	$ 235,116
Level 1
Investment securities available for sale:
Total securities available for sale	0	0	0
Level 2
Investment securities available for sale:
Total securities available for sale	280,434	201,638	235,116
Level 3
Investment securities available for sale:
Total securities available for sale	0	$ 0	0
Recurring basis
Investment securities available for sale:
Total securities available for sale	280,434		235,116
Recurring basis | Municipal bonds
Investment securities available for sale:
Total securities available for sale	120,431		85,433
Recurring basis | Mortgage-backed securities
Investment securities available for sale:
Total securities available for sale	160,003		149,683
Recurring basis | Level 1
Investment securities available for sale:
Total securities available for sale	0		0
Recurring basis | Level 1 | Municipal bonds
Investment securities available for sale:
Total securities available for sale	0		0
Recurring basis | Level 1 | Mortgage-backed securities
Investment securities available for sale:
Total securities available for sale	0		0
Recurring basis | Level 2
Investment securities available for sale:
Total securities available for sale	280,434		235,116
Recurring basis | Level 2 | Municipal bonds
Investment securities available for sale:
Total securities available for sale	120,431		85,433
Recurring basis | Level 2 | Mortgage-backed securities
Investment securities available for sale:
Total securities available for sale	160,003		149,683
Recurring basis | Level 3
Investment securities available for sale:
Total securities available for sale	0		0
Recurring basis | Level 3 | Municipal bonds
Investment securities available for sale:
Total securities available for sale	0		0
Recurring basis | Level 3 | Mortgage-backed securities
Investment securities available for sale:
Total securities available for sale	$ 0		$ 0