Parent Company Financial Statements - Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities
Net income	$ 124,555	$ 190,285	$ 63,621
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Stock-based compensation expense	9,857	10,282	10,214
Net cash provided by (used in) operating activities	789,326	54,878	(270,002)
Investing Activities
Net cash (used in) provided by investing activities	(1,744,118)	(849,558)	310,136
Financing Activities
Payments on subordinated debt	0	(60,000)	0
Amortization of issuance costs and (accretion) of subordinated debt fair value premium, net	387	17	(397)
Share based compensation withholding payments	(2,842)	(10,158)	(1,510)
Net proceeds from sale of common stock under employee stock purchase program	1,212	1,480	978
Repurchase of common stock	(39,979)	(7,595)	0
Dividends paid on common stock	(24,503)	(20,866)	(14,177)
Dividend equivalent payments made upon vesting of equity compensation	(168)	(717)	(87)
Net cash provided by financing activities	184,104	1,274,522	1,045,083
Net change in cash and cash equivalents	(770,688)	479,842	1,085,217
Cash and cash equivalents at beginning of the period	1,797,740	1,317,898	232,681
Cash and cash equivalents at end of the period	1,027,052	1,797,740	1,317,898
Supplemental cash flow information:
Dividends declared not paid on restricted stock units	222	400	238
Parent Company
Operating Activities
Net income	124,555	190,285	63,621
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity in undistributed income of bank subsidiary	(76,232)	(68,351)	(15,168)
Equity in undistributed income of nonbank subsidiary	(2,180)	635	(506)
Gain on investments	0	(249)	(217)
Stock-based compensation expense	9,857	10,282	10,214
Increase in other assets	(802)	(3,916)	(9,717)
Decrease in other liabilities	(7,381)	(678)	(11,853)
Net cash provided by (used in) operating activities	47,817	128,008	36,374
Investing Activities
Net cash paid in business combinations (See Note 2)	0	0	(35,505)
Proceeds from sale of equity securities	0	1,422	0
Net cash (used in) provided by investing activities	0	1,422	(35,505)
Financing Activities
Payments on subordinated debt	0	(60,000)	0
Amortization of issuance costs and (accretion) of subordinated debt fair value premium, net	0	(369)	(436)
Payments on other borrowings	0	(15,000)	0
Proceeds from other borrowings	0	0	15,000
Share based compensation withholding payments	(2,842)	(10,158)	(1,510)
Net proceeds from sale of common stock under employee stock purchase program	1,212	1,480	978
Repurchase of common stock	(39,979)	(7,595)	0
Dividends paid on common stock	(24,503)	(20,866)	(14,177)
Dividend equivalent payments made upon vesting of equity compensation	(168)	(717)	(87)
Net cash provided by financing activities	(66,280)	(113,225)	(232)
Net change in cash and cash equivalents	(18,463)	16,205	637
Cash and cash equivalents at beginning of the period	21,515	5,310	4,673
Cash and cash equivalents at end of the period	3,052	21,515	5,310
Supplemental cash flow information:
Dividends declared not paid on restricted stock units	222	400	238
Noncash dividend from bank subsidiary	0	0	956
Noncash security distribution to bank subsidiary	$ 0	$ 2,646	$ 0