Parent Company Financial Statements - Schedule of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities
Net income	$ 120,224	$ 124,555	$ 190,285
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	10,381	9,857	10,282
Net cash provided by operating activities	211,072	789,713	54,895
Investing Activities
Net cash used in investing activities	(55,215)	(1,744,118)	(849,558)
Financing Activities
Payments on subordinated debt	0	0	(60,000)
Share based compensation withholding payments	(3,379)	(2,842)	(10,158)
Net proceeds from sale of common stock under employee stock purchase program	723	1,212	1,480
Repurchase of common stock	(4,944)	(39,979)	(7,595)
Dividends paid on common stock	(28,057)	(24,503)	(20,866)
Dividend equivalent payments made upon vesting of equity compensation	(226)	(168)	(717)
Net cash (used in) provided by financing activities	(371,977)	183,717	1,274,505
Net change in cash and cash equivalents	(216,120)	(770,688)	479,842
Cash and cash equivalents at beginning of the period	1,027,052	1,797,740	1,317,898
Cash and cash equivalents at end of the period	810,932	1,027,052	1,797,740
Supplemental cash flow information:
Dividends declared not paid on restricted stock units	287	222	400
Parent Company
Operating Activities
Net income	120,224	124,555	190,285
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed income of bank subsidiary	(73,832)	(76,232)	(68,351)
Equity in undistributed income of nonbank subsidiary	553	(2,180)	635
Accretion of subordinated debt fair value premium	0	0	(369)
Gain on investments	0	0	(249)
Stock-based compensation expense	10,381	9,857	10,282
Decrease (increase) in other assets	1,017	(802)	(3,916)
Decrease in other liabilities	(4,064)	(7,381)	(678)
Net cash provided by operating activities	54,279	47,817	127,639
Investing Activities
Proceeds from sale of equity securities	0	0	1,422
Net cash used in investing activities	0	0	1,422
Financing Activities
Payments on subordinated debt	0	0	(60,000)
Payments on other borrowings	0	0	(15,000)
Share based compensation withholding payments	(3,379)	(2,842)	(10,158)
Net proceeds from sale of common stock under employee stock purchase program	723	1,212	1,480
Repurchase of common stock	(4,944)	(39,979)	(7,595)
Dividends paid on common stock	(28,057)	(24,503)	(20,866)
Dividend equivalent payments made upon vesting of equity compensation	(226)	(168)	(717)
Net cash (used in) provided by financing activities	(35,883)	(66,280)	(112,856)
Net change in cash and cash equivalents	18,396	(18,463)	16,205
Cash and cash equivalents at beginning of the period	3,052	21,515	5,310
Cash and cash equivalents at end of the period	21,448	3,052	21,515
Supplemental cash flow information:
Dividends declared not paid on restricted stock units	287	222	400
Noncash security distribution to bank subsidiary	$ 0	$ 0	$ 2,646