Condensed Consolidated Statements of Cash Flows $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Cash flows from operating activities:
Net income	$ 82,244	$ 45,453
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	4,609	4,573
Provision for credit losses	17,045	55,935
Deferred income taxes	(8,813)	(9,609)
Net amortization of debt securities	5,704	4,775
Amortization of intangible assets	4,199	4,256
Amortization of servicing assets	690	0
Mortgage loans originated-for-sale	(120,700)	(164,151)
Proceeds from mortgage loans sold	128,687	157,377
Sale of investment securities	0	(421)
Sale of other real estate	(931)	13
Sale of state tax credits	(437)	(290)
Asset impairment	3,441	0
Share-based Payment Arrangement, Noncash Expense	4,108	3,069
Net accretion of loan discount	(1,672)	(5,976)
Changes in other assets and liabilities, net
Increase (Decrease) in Other Operating Assets and Liabilities, Net	(12,544)	5,243
Net cash provided by operating activities	105,630	100,247
Cash flows from investing activities:
Proceeds from acquisition, net	212,642	0
Net decrease (increase) in loans	42,865	(800,812)
Sale of debt securities, available-for-sale	27,135	20,221
Paydown or maturity of debt securities, available-for-sale	222,993	234,267
Paydown or maturity of debt securities, held-to-maturity	42,874	25,833
Redemption of other investments	16,952	26,350
Sale of state tax credits held for sale	5,534	5,621
Sale of other real estate	5,915	652
Settlement of bank-owned life insurance policies	0	1,993
Payments for the purchase of:
Available-for-sale debt securities	(547,526)	(274,677)
Other investments	(7,629)	(40,714)
State tax credits held for sale	(6,688)	(11,026)
Fixed assets, net	(1,635)	(1,633)
Net cash provided by (used in) investing activities	13,432	(813,925)
Cash flows from financing activities:
Net increase in noninterest-bearing deposit accounts	666,480	602,192
Net increase in interest-bearing deposit accounts	335,477	303,011
Net increase (decrease) in FHLB advances	(160,000)	27,700
Repayments of Long-term Debt	(5,714)	(4,286)
Proceeds from issuance of subordinated debentures, net	0	61,953
Net decrease in other borrowings	(51,597)	(21,848)
Cash dividends paid on common stock	(18,566)	(14,176)
Payments for Repurchase of Common Stock	(33,069)	(15,347)
Proceeds from (Payments for) Other Financing Activities	(489)	(562)
Net cash provided by financing activities	732,522	938,637
Net increase in cash and cash equivalents	851,584	224,959
Cash and cash equivalents, beginning of period	537,703	167,256
Cash and cash equivalents, end of period	1,389,287	392,215
Noncash transactions:
Cash paid during the period for interest	16,679	26,858
Income Taxes Paid, Net	45,230	7,514
Transfer to other real estate owned in settlement of loans	3,227	261
Sales of other real estate financed	228	48
Right-of-use assets obtained in exchange for lease obligations	$ 4,319	$ 200
Common shares issued in connection with acquisition	343,650	0
Transfer to Investments	$ 0	$ 163,592