Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income		$ 26,894	$ 26,600
Purchases of available for sale debt securities		(204,228)	(192,713)
Proceeds from sales of acquired available for sale debt securities		91,094	0
Proceeds from maturities and paydowns of available for sale debt securities		80,122	189,047
Proceeds from redemption of Federal Home Loan Bank stock		3,881	0
Net change in non-PPP loans		(158,253)	12,616
Purchases of premises and equipment		(1,752)	(2,526)
Proceeds from sale or disposal of premises and equipment		0	1,222
Other investment activities		(3,965)	(646)
Proceeds from sales of other real estate owned		261	0
Cash from acquisition, net of cash paid		24,981	0
Net cash provided by (used in) investing activities		68,005	(623,082)
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		2,672	12,950
Depreciation, amortization and accretion, net		4,888	2,815
Deferred income tax expense (benefit)		2,307	(1,947)
Gain on sale of mortgage loans held for sale		(2,118)	(2,593)
Origination of mortgage loans held for sale		(119,431)	(103,509)
Proceeds from sale of mortgage loans held for sale		141,747	97,486
Bank owned life insurance income	[1]	(367)	(355)
(Gain)/loss on the disposal of premises and equipment		41	(209)
Gain on the sale of other real estate owned		(47)	0
Stock compensation expense		2,263	1,793
Excess tax (benefit) expense from share-based compensation arrangements		(1,150)	3
Net change in accrued interest receivable and other assets		(4,420)	(14,245)
Net change in accrued interest payable and other liabilities		(6,105)	9,891
Net cash provided by operating activities		47,174	28,680
Cash flows from financing activities:
Net change in deposits		232,255	593,179
Net change in securities sold under agreements to repurchase and federal funds purchased		4,086	8,341
Proceeds from Federal Home Loan Bank advances		20,000	60,000
Repayments of Federal Home Loan Bank advances		(132,745)	(78,629)
Share repurchases related to compensation plans		(3,166)	(1,544)
Cash dividends paid		(13,361)	(12,275)
Net cash provided by financing activities		107,069	569,072
Net change in cash and cash equivalents		222,248	(25,330)
Beginning cash and cash equivalents		317,945	249,724
Ending cash and cash equivalents		540,193	224,394
Supplemental cash flow information:
Interest paid		2,971	7,583
Income taxes paid, net of refunds		13,359	418
Cash paid for operating lease liabilities		1,190	1,104
Supplemental non-cash activity:
Unfunded commitments in tax credit investments		5,766	5,503
Due to broker		1,985	0
Dividends payable		175	172
Loans transferred to OREO		30	0
Fair value of assets acquired		1,389,327
Consideration paid in acquisition		28,276
Common stock issued in acquisition		204,670
Total consideration paid		232,946
Liabilities assumed		1,156,381
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]
Cash flows from operating activities:
Net change in PPP loans		$ 235,864	$ (630,082)

[1] Outside of the scope of ASC 606.