Investment Securities, Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Security	Dec. 31, 2015 USD ($)
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value	$ 250,069	$ 153,730
Less than 12 months unrealized loss	1,905	1,672
12 months or more fair value	0	7,277
12 months or more unrealized loss	0	142
Total fair value	250,069	161,007
Total unrealized loss	$ 1,905	1,814
Less than 12 months, number of positions | Security	209
12 months or more, number of positions | Security	0
Number of investment securities held | Security	500
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value	$ 7,251	839
Less than 12 months unrealized loss	40	1
12 months or more fair value	0	0
12 months or more unrealized loss	0	0
Total fair value	7,251	839
Total unrealized loss	$ 40	1
Government Agency & Government-Sponsored Entities [Member]
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value		29,944
Less than 12 months unrealized loss		419
12 months or more fair value		0
12 months or more unrealized loss		0
Total fair value		29,944
Total unrealized loss		419
Less than 12 months, number of positions | Security	0
12 months or more, number of positions | Security	0
US Govt SBA [Member]
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value	$ 27,483
Less than 12 months unrealized loss	260
12 months or more fair value	0
12 months or more unrealized loss	0
Total fair value	27,483
Total unrealized loss	$ 260
Less than 12 months, number of positions | Security	138
12 months or more, number of positions | Security	0
US Treasury Notes [Member]
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value	$ 99,429	44,887
Less than 12 months unrealized loss	332	164
12 months or more fair value	0	0
12 months or more unrealized loss	0	0
Total fair value	99,429	44,887
Total unrealized loss	$ 332	164
Less than 12 months, number of positions | Security	8
12 months or more, number of positions | Security	0
Mortgage Backed Securities [Member]
Available-for-sale Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months fair value	$ 123,157	78,899
Less than 12 months unrealized loss	1,313	1,089
12 months or more fair value	0	7,277
12 months or more unrealized loss	0	142
Total fair value	123,157	86,176
Total unrealized loss	$ 1,313	1,231
Less than 12 months, number of positions | Security	45
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	$ 7,251	839
Less than 12 months unrealized loss	40	1
12 months or more fair value	0	0
12 months or more unrealized loss	0	0
Total fair value	7,251	839
Total unrealized loss	$ 40	$ 1
Less than 12 months, number of positions | Security	18
12 months or more, number of positions | Security	0
Municipal Bonds [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Percentage of portfolio rated at either issue or issuer level	98.00%
Percentage of portfolio not rated	3.00%