Securities - Securities Available for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Amortized cost
Total debt securities	$ 548,317	$ 533,203
Unrealized Gains (Losses)
Accumulated gross unrealized gain, before tax	23,569	10,617
Accumulated gross unrealized loss, before tax	(1,304)	(1,507)
Amortized Cost
Securities available for sale	570,582	542,313
U.S. Gov’t sponsored entities
Amortized cost
Total debt securities	119,158	124,189
Unrealized Gains (Losses)
Accumulated gross unrealized gain, before tax	6,908	2,924
Accumulated gross unrealized loss, before tax	0	(19)
Amortized Cost
Securities available for sale	126,066	127,094
State & political subdivisions
Amortized cost
Total debt securities	99,926	101,177
Unrealized Gains (Losses)
Accumulated gross unrealized gain, before tax	3,664	3,288
Accumulated gross unrealized loss, before tax	(298)	(102)
Amortized Cost
Securities available for sale	103,292	104,363
Residential & multi-family mortgage
Amortized cost
Total debt securities	295,695	273,404
Unrealized Gains (Losses)
Accumulated gross unrealized gain, before tax	12,052	4,117
Accumulated gross unrealized loss, before tax	(227)	(885)
Amortized Cost
Securities available for sale	307,520	276,636
Corporate notes & bonds
Amortized cost
Total debt securities	8,350	8,350
Unrealized Gains (Losses)
Accumulated gross unrealized gain, before tax	12	14
Accumulated gross unrealized loss, before tax	(740)	(282)
Amortized Cost
Securities available for sale	7,622	8,082
Pooled SBA
Amortized cost
Total debt securities	24,168	25,063
Unrealized Gains (Losses)
Accumulated gross unrealized gain, before tax	933	274
Accumulated gross unrealized loss, before tax	0	(163)
Amortized Cost
Securities available for sale	25,101	25,174
Other
Amortized cost
Total debt securities	1,020	1,020
Unrealized Gains (Losses)
Accumulated gross unrealized gain, before tax	0	0
Accumulated gross unrealized loss, before tax	(39)	(56)
Amortized Cost
Securities available for sale	$ 981	$ 964