Investment Securities, Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) Security	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 59,993	$ 153,730	$ 36,898
Less than 12 months, unrealized loss	1	1,672	256
12 months or more, fair value	0	7,277	7,593
12 months or more, unrealized loss	0	142	56
Total, fair value	59,993	161,007	44,491
Total, unrealized loss	$ 1	1,814	312
Number of investment securities held | Security	244
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	1,991
Less than 12 months, unrealized loss		1	26
12 months or more, fair value		0	0
12 months or more, unrealized loss		0	0
Total, fair value		839	1,991
Total, unrealized loss		1	26
Government Agency & Government-Sponsored Entities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 59,993	29,944
Less than 12 months, unrealized loss	1	419
12 months or more, fair value	0	0
12 months or more, unrealized loss	0	0
Total, fair value	59,993	29,944
Total, unrealized loss	1	419	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	0	164	0
Mortgage Backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value		78,899	36,898
Less than 12 months, unrealized loss		1,089	256
12 months or more, fair value		7,277	7,593
12 months or more, unrealized loss		142	56
Total, fair value		86,176	44,491
Total, unrealized loss	0	1,231	312
Obligations of States and Political Subdivisions [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value		839	1,991
Less than 12 months, unrealized loss		1	26
12 months or more, fair value		0	0
12 months or more, unrealized loss		0	0
Total, fair value		839	1,991
Total, unrealized loss	$ 0	$ 1	$ 26
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%