Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income		$ 6,583	$ 7,487
Securities available for sale:
Change in unrealized holding gains		0	1,803
Reclassification adjustment for net losses realized in net income	[1]	0	1,022
Net change in unrealized gains		0	2,825
Tax effect		0	(904)
Net-of-tax amount		0	1,921
Securities held to maturity:
Reclassification adjustment for amortization of amounts previously recorded upon transfer from available-for-sale	[2]	(18)	(23)
Tax effect		5	(4)
Net-of-tax amount		(13)	(27)
Defined benefit pension plan:
Reclassification adjustment for net actuarial loss recognized in net periodic benefit cost	[3]	66	89
Tax effect		(19)	(59)
Net-of-tax amount		47	30
Other comprehensive income		34	1,924
Comprehensive income		$ 6,617	$ 9,411

[1] Amounts are included in gain (loss) on sales of available for sale securities, net, in the consolidated statements of net income. Income tax benefit associated with the reclassification adjustment for the three months ended March 31, 2017 was $(356,000).

[2] Amounts are included in interest income on securities in the consolidated statements of net income.

[3] Amounts are included in salaries and benefits expense in the consolidated statements of net income.