Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Paid-in Capital	Retained Earnings- Substantially Restricted	Retained Earnings- Substantially Restricted Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comp-rehensive (Loss) Income
Balance (in shares) at Dec. 31, 2019			92,289,750
Balance at Dec. 31, 2019	$ 1,960,733	$ (12,347)	$ 923	$ 1,378,534	$ 541,050	$ (12,347)	$ 40,226
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	266,400				266,400
Other comprehensive (loss) income	102,864						102,864
Cash dividends declared	(127,159)				(127,159)
Stock issued in connection with acquisitions (in shares)			3,007,044
Stock issued in connection with acquisitions	112,133		$ 30	112,103
Stock issuances under stock incentive plans (in shares)			129,570
Stock issuances under stock incentive plans	0		$ 1	(1)
Stock-based compensation and related taxes	4,417			4,417
Balance (in shares) at Dec. 31, 2020			95,426,364
Balance at Dec. 31, 2020	2,307,041		$ 954	1,495,053	667,944		143,090
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	284,757				284,757
Other comprehensive (loss) income	(115,731)						(115,731)
Cash dividends declared	(142,359)				(142,359)
Stock issued in connection with acquisitions (in shares)			15,173,482
Stock issued in connection with acquisitions	839,853		$ 152	839,701
Stock issuances under stock incentive plans (in shares)			87,687
Stock issuances under stock incentive plans	0		$ 1	(1)
Stock-based compensation and related taxes	$ 4,061			4,061
Balance (in shares) at Dec. 31, 2021	110,687,533		110,687,533
Balance at Dec. 31, 2021	$ 3,177,622		$ 1,107	2,338,814	810,342		27,359
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	303,202				303,202
Other comprehensive (loss) income	(496,151)						(496,151)
Cash dividends declared	(146,560)				(146,560)
Stock issuances under stock incentive plans (in shares)			90,247
Stock issuances under stock incentive plans	0		$ 1	(1)
Stock-based compensation and related taxes	$ 5,192			5,192
Balance (in shares) at Dec. 31, 2022	110,777,780		110,777,780
Balance at Dec. 31, 2022	$ 2,843,305		$ 1,108	$ 2,344,005	$ 966,984		$ (468,792)