CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income			$ 71,896	$ 42,311
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation			4,087	4,006
Provision for credit losses		$ 20,342	6,713	48,624
Stock-based compensation expense			1,865	1,536
Deferred compensation expense accrued			3,288	2,660
Gains on other real estate owned, net			(1,754)	(298)
Amortization of premiums on securities, net			1,506	728
Caplet amortization			495	383
Mark to market gains on unhedged derivatives, net			(74)
Securities (gains) losses, net			88	(1,867)
Loans originated for sale			(157,392)	(172,282)
Proceeds on sales of loans			161,173	170,362
Gains on sales of residential real estate loans	$ (954)	(1,370)	(3,475)	(3,218)
Loss on liability extinguishment, net		1,874		2,450
Losses (gains) on sales and disposals of premises and equipment			1,457	(13)
Amortization of intangibles	508	531	1,524	1,628
Accretion of acquisition fair value adjustments, net			(1,251)	(2,194)
Increase in cash value of bank-owned life insurance			(1,369)	(1,443)
Loss on sale of subsidiary/certain assets and liabilities of subsidiary		(305)		(305)
Goodwill impairment				500
Increase in other assets			(37,630)	(8,351)
Decrease in other liabilities			13,161	43,489
Net cash provided by operating activities			64,308	129,316
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease in federal funds sold			2,095	9,270
Net decrease (increase) in interest-bearing deposits at financial institutions			22,755	(154,247)
Proceeds from sales of other real estate owned			4,592	4,353
Activity in securities portfolio:
Purchases			(151,702)	(255,500)
Calls, maturities and redemptions			81,000	38,461
Paydowns			50,177	33,870
Sales			23,874	28,579
Activity in restricted investment securities:
Purchases			(4,280)	(4,600)
Redemptions			2,447	8,843
Proceeds from the liquidation of bank-owned life insurance				10,999
Net increase in loans/leases originated and held for investment			(353,616)	(555,315)
Purchase of premises and equipment			(7,866)	(2,250)
Proceeds from sales of premises and equipment			22	94
Net cash transferred In sale of subsidiary				(349)
Net cash used in investing activities			(330,502)	(837,792)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposit accounts			272,691	731,374
Net increase (decrease) in short-term borrowings			(3,830)	17,007
Activity in Federal Home Loan Bank advances:
Term advances				125,000
Calls and maturities				(81,600)
Net change in short-term and overnight advances			15,000	(109,300)
Activity in other borrowings:
Prepayments				(55,274)
Prepayments of subordinated notes			(5,000)
Proceeds from subordinated notes				50,000
Payment of cash dividends on common stock			(2,847)	(2,831)
Proceeds from issuance of common stock, net			328	1,199
Repurchase and cancellation of shares			(14,167)	(3,780)
Net cash provided by financing activities			262,175	701,154
Net increase (decrease) in cash and due from banks			(4,019)	(7,322)
Cash and due from banks, beginning			61,329	76,254	$ 76,254
Cash and due from banks, ending	$ 57,310	$ 68,932	57,310	68,932	$ 61,329
Supplemental disclosure of cash flow information, cash payments for:
Interest			18,617	26,920
Income/franchise taxes			36,987	16,713
Supplemental schedule of noncash investing activities:
Change in accumulated other comprehensive income, unrealized losses on securities available for sale and derivative instruments, net			(118)	(683)
Transfers of loans to other real estate owned			2,812	51
Due to broker for purchases of securities				8,550
Increase (decrease) in the fair value of back-to-back interest rate swap assets and liabilities			(25,503)	151,398
Dividends payable			$ 946	945
Consideration received on sale of the Bates Companies				$ 1,328