Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 11,674	$ 6,491	$ 28,895	$ 25,573
Other comprehensive (loss) income:
Unrealized holding gain (loss) on securities available-for-sale	239	1,226	(2,723)	3,191
Income tax effect	(56)	(331)	638	(862)
Reclassification adjustment for gain recognized in income	(529)	(35)	(3,380)	(865)
Income tax effect	124	9	793	234
Change in defined benefit pension plan	(914)	(102)	1,112	(1,809)
Income tax effect	214	28	(261)	489
Reclassification adjustment for amortization of net actuarial loss recognized in income	127	105	381	315
Income tax effect	(30)	(28)	(89)	(85)
Reclassification adjustment for carrying value adjustment - investment hedge recognized in income	14	95	637	(738)
Income tax effect	(3)	(26)	(149)	199
Total other comprehensive (loss) income	(814)	941	(3,041)	69
Comprehensive loss attributable to noncontrolling interest	154	0	265	0
Comprehensive income	$ 11,014	$ 7,432	$ 26,119	$ 25,642