Comprehensive Income - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Comprehensive Income
Gain on sale of available-for-sale securities	$ 529	$ 35	$ 3,380	$ 865
Income tax expense	(3,164)	(2,021)	(7,006)	(8,208)
Net income before noncontrolling interest	11,828	6,491	29,160	25,573
Salaries and employee benefits	(16,528)	(10,519)	(42,100)	(49,360)
Interest on investment securities	575	411	1,831	1,554
Amount reclassified from AOCI
Comprehensive Income
Net income before noncontrolling interest	297	(120)	1,807	940
Available-for-sale securities | Amount reclassified from AOCI
Comprehensive Income
Gain on sale of available-for-sale securities	529	35	3,380	865
Income tax expense	(124)	(9)	(793)	(234)
Net income before noncontrolling interest	405	26	2,587	631
Defined benefit pension plan items | Amount reclassified from AOCI
Comprehensive Income
Income tax expense	30	28	89	85
Net income before noncontrolling interest	(97)	(77)	(292)	(230)
Salaries and employee benefits	(127)	(105)	(381)	(315)
Investment hedge | Amount reclassified from AOCI
Comprehensive Income
Income tax expense	3	26	149	(199)
Net income before noncontrolling interest	(11)	(69)	(488)	539
Interest on investment securities	$ (14)	$ (95)	$ (637)	$ 738