Investment Securities, Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) Security	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 41,525	$ 153,730	$ 38,031
Less than 12 months, unrealized loss	8	1,672	29
12 months or more, fair value	0	7,277	25,942
12 months or more, unrealized loss	0	142	168
Total, fair value	41,525	161,007	63,973
Total, unrealized loss	$ 8	1,814	197
Number of investment securities held | Security	227
Less than 12 months, number of positions | Security	3
12 months or more, number of positions | Security	0
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value		839	1,340
Less than 12 months, unrealized loss		1	11
12 months or more, fair value		0	0
12 months or more, unrealized loss		0	0
Total, fair value		839	1,340
Total, unrealized loss		1	11
Government Agency & Government Sponsored Entities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 39,996	29,944	24,998
Less than 12 months, unrealized loss	1	419	1
12 months or more, fair value	0	0	0
12 months or more, unrealized loss	0	0	0
Total, fair value	39,996	29,944	24,998
Total, unrealized loss	$ 1	419	1
Less than 12 months, number of positions | Security	2
12 months or more, number of positions | Security	0
US Treasury Notes [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value		44,887
Less than 12 months, unrealized loss		164
12 months or more, fair value		0
12 months or more, unrealized loss		0
Total, fair value		44,887
Total, unrealized loss		164
Less than 12 months, number of positions | Security	0
12 months or more, number of positions | Security	0
Mortgage Backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 1,529	78,899	13,033
Less than 12 months, unrealized loss	7	1,089	28
12 months or more, fair value	0	7,277	25,942
12 months or more, unrealized loss	0	142	168
Total, fair value	1,529	86,176	38,975
Total, unrealized loss	$ 7	1,231	196
Less than 12 months, number of positions | Security	1
12 months or more, number of positions | Security	0
Obligations of States and Political Subdivisions [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value		839	1,340
Less than 12 months, unrealized loss		1	11
12 months or more, fair value		0	0
12 months or more, unrealized loss		0	0
Total, fair value		839	1,340
Total, unrealized loss		$ 1	$ 11
Less than 12 months, number of positions | Security	0
12 months or more, number of positions | Security	0
Municipal Bonds [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Percentage of bank qualified municipal bond portfolio rated	98.00%
Percentage of portfolio not rated	2.00%