Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Cash Flows From Operating Activities:
Net income		$ 44,347	$ 42,384
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and accretion		9,301	7,564
Provision for credit losses		6,500	9,000
Increase in cash surrender value of life insurance		(1,658)	(1,647)
Stock-based compensation expense		5,222	4,216
Asset (gains) losses, net		(3,716)	1,185
Gain on sale of loans held for sale, net		(16,289)	(22,217)
Net change due to:
Proceeds from sale of loans held for sale		503,405	663,466
Origination of loans held for sale		(485,641)	(650,660)
Accrued interest receivable and other assets		(6,721)	4,781
Accrued interest payable and other liabilities		(2,488)	6,200
Net cash provided by (used in) operating activities		52,262	64,272
Cash Flows From Investing Activities:
Net decrease in loans		10,406
Net (increase) in loans			(244,751)
Net (increase) decrease in certificates of deposit in other banks		8,561	5,719
Purchases of securities AFS		(214,343)	(128,661)
Purchases of securities HTM		(20,996)	0
Proceeds from sales of securities AFS		15,975	14,864
Proceeds from calls and maturities of securities AFS		81,681	69,568
Purchases of other investments		(4,787)	(3,815)
Proceeds from sales of other investments		1,534	0
Proceeds from redemption of BOLI		0	245
Net (increase) decrease in premises and equipment		(6,894)	(9,708)
Net (increase) decrease in other real estate and other assets		1,046	0
Net cash (paid) received in business combination		394,868	(21,820)
Net cash provided by (used in) investing activities		267,051	(318,359)
Cash Flows From Financing Activities:
Net increase (decrease) in deposits		199,698	617,373
Proceeds from long-term borrowings		103,953	367,841
Repayments of long-term borrowings		(42,559)	(32,029)
Purchase and retirement of common stock		(34,440)	(28,947)
Proceeds from issuance of common stock		395	482
Proceeds from exercise of stock options		1,386	1,048
Distribution to noncontrolling interest		0	(176)
Net cash provided by (used in) financing activities		228,433	925,592
Net increase (decrease) in cash and cash equivalents		547,746	671,505
Cash and cash equivalents:
Beginning		802,859	182,059
Ending	[1]	1,350,605	853,564
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest		9,320	18,130
Cash paid for taxes		24,116	16,353
Transfer of loans and bank premises to other real estate owned		302	0
Capitalized mortgage servicing rights		3,191	4,038
Acquisitions:
Fair value of assets acquired		1,544,518	0
Fair value of liabilities assumed		1,407,605	0
Net assets acquired		$ 136,913	$ 0

[1] Cash and cash equivalents at both September 30, 2021 and September 30, 2020, include restricted cash of $1.9 million pledged as collateral on interest rate swaps and no reserve balance was required with the Federal Reserve Bank.