CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 8,583	$ 6,765	$ 22,570	$ 20,166
Other comprehensive income:
Change in net unrealized holding gains on available-for-sale securities and I/O strips	539	208	2,975	7,770
Deferred income taxes	(227)	(87)	(1,250)	(3,263)
Change in net unamortized unrealized gain on securities available-for-sale that were reclassified to securities held-to-maturity	(12)	(13)	(38)	(103)
Deferred income taxes	5	5	16	43
Reclassification adjustment for losses (gains) realized in income			6	(527)
Deferred income taxes			(2)	221
Change in unrealized gains on securities and I/O strips, net of deferred income taxes	305	113	1,707	4,141
Change in net pension and other benefit plan liability adjustment	39	37	116	123
Deferred income taxes	(17)	(16)	(49)	(52)
Change in pension and other benefit plan liability, net of deferred income taxes	22	21	67	71
Other comprehensive income	327	134	1,774	4,212
Total comprehensive income	$ 8,910	$ 6,899	$ 24,344	$ 24,378