Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income	$ 17,333	$ 10,179	$ 42,668	$ 35,164
Other comprehensive income (loss), net of tax:
Amortization of actuarial losses, net of taxes of $(41) and ($64) for the three months ended September 30, 2018 and 2017, respectively and of ($124) and ($192) for nine months ended September 30, 2018 and 2017, respectively.	91	88	272	262
Amortization of prior service credits, net of taxes of $3 and $5 for the three months ended September 30, 2018 and 2017, respectively and of $8 and $14 for nine months ended September 30, 2018 and 2017, respectively.	(7)	(7)	(20)	(20)
Reclassification adjustment for net gains included in income, net of taxes of ($78) for the three and nine months ended September 30, 2017.		108		108
Net unrealized (losses) gains on securities, net of taxes of $1,612and $241 for three months ended September 30, 2018 and 2017, respectively and of $6,055 and ($1,006) for nine months ended September 30, 2018 and 2017, respectively.	(3,505)	(333)	(13,159)	1,416
Net unrealized gains (losses) on cash flow hedges, net of taxes of ($860) and ($41) three months ended September 30, 2018 and 2017, respectively and of ($4,425) and $49 for nine months ended September 30, 2018 and 2017, respectively.	1,870	56	9,616	(68)
Change in fair value of liabilities related to instrument-specific credit risk, net of taxes of ($4) and ($10) for the three and nine months ended September 30, 2018, respectively.	9		22
Total other comprehensive income (loss), net of tax	(1,542)	(88)	(3,269)	1,698
Comprehensive income	$ 15,791	$ 10,091	$ 39,399	$ 36,862