Comprehensive Income - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Comprehensive Income
Gain (loss) on sale of available-for-sale securities	$ 1,708	$ 554	$ 2,851	$ 830
Total before tax	10,836	24,042	21,063	25,269
Income tax expense	(1,673)	(6,008)	(3,842)	(6,187)
Net income before noncontrolling interest	9,247	18,034	17,332	19,082
Salaries and benefits	(13,661)	(22,659)	(25,572)	(38,841)
Interest on investment securities	625	477	1,256	1,143
Amount reclassified from AOCI
Comprehensive Income
Net income before noncontrolling interest	936	(374)	1,511	1,060
Available-for-sale securities | Amount reclassified from AOCI
Comprehensive Income
Gain (loss) on sale of available-for-sale securities	1,708	554	2,851	830
Total before tax	1,708	554	2,851	830
Income tax expense	(400)	(150)	(668)	(225)
Net income before noncontrolling interest	1,308	404	2,183	605
Defined benefit pension plan items | Amount reclassified from AOCI
Comprehensive Income
Total before tax	(127)	(105)	(254)	(210)
Income tax expense	30	28	59	57
Net income before noncontrolling interest	(97)	(77)	(195)	(153)
Salaries and benefits	(127)	(105)	(254)	(210)
Investment hedge | Amount reclassified from AOCI
Comprehensive Income
Total before tax	(359)	(960)	(623)	833
Income tax expense	84	259	146	(225)
Net income before noncontrolling interest	(275)	(701)	(477)	608
Interest on investment securities	$ (359)	$ (960)	$ (623)	$ 833