Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Adjustment	Adjusted Balance	Minnesota-Based Klein Financial, Inc.	Common Stock	Common Stock Adjusted Balance	Common Stock Minnesota-Based Klein Financial, Inc.	Capital Surplus	Capital Surplus Adjusted Balance	Capital Surplus Minnesota-Based Klein Financial, Inc.	Retained Earnings	Retained Earnings Adjustment	Retained Earnings Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Adjustment	Accumulated Other Comprehensive Income (Loss) Adjusted Balance
Beginning Balance at Dec. 31, 2017	$ 2,154,397	$ (4,179)	$ 2,150,218		$ 152,040	$ 152,040		$ 1,639,499	$ 1,639,499		$ 413,130	$ (4,127)	$ 409,003	$ (50,272)	$ (52)	$ (50,324)
Reclassification of certain tax effects related to the Tax Cuts and Jobs Act of 2017	(10,751)										10,751			(10,751)
Net income	190,830										190,830
Other comprehensive income (loss)	16,125													16,125
Acquisition	406,474			$ 406,474			$ 22,772			$ 383,702
Dividends - common stock	(82,161)										(82,161)
Common stock issued	497				29			468
Common stock repurchased	(1,805)				(104)			(1,701)
Share-based compensation expense	8,118							8,118
Stock activity under incentive compensation plans	1,274				404			1,609			(739)
Ending Balance at Dec. 31, 2018	2,689,570	6,322	2,695,892		175,141	175,141		2,031,695	2,031,695		527,684	6,322	534,006	(44,950)		(44,950)
Net income	238,206										238,206
Other comprehensive income (loss)	101,157													101,157
Dividends - common stock	(89,474)										(89,474)
Common stock issued	567				36			531
Common stock repurchased	(102,413)				(6,174)			(96,239)
Share-based compensation expense	7,993							7,993
Stock activity under incentive compensation plans	525				613			465			(553)
Ending Balance at Dec. 31, 2019	2,852,453	$ (31,150)	$ 2,821,303		169,616	$ 169,616		1,944,445	$ 1,944,445		682,185	$ (31,150)	$ 651,035	56,207		$ 56,207
Net income	226,409										226,409
Other comprehensive income (loss)	91,564													91,564
Dividends - common stock	(92,946)										(92,946)
Common stock issued	577				43			534
Common stock repurchased	(82,358)				(5,115)			(77,243)
Share-based compensation expense	7,707							7,707
Stock activity under incentive compensation plans	400				823			183			(606)
Ending Balance at Dec. 31, 2020	$ 2,972,656				$ 165,367			$ 1,875,626			$ 783,892			$ 147,771