Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income		$ 22,710	$ 13,232
Purchases of available for sale debt securities		(139,649)	(85,100)
Proceeds from maturities and paydowns of available for sale debt securities		38,138	118,060
Proceeds from redemption of Federal Home Loan Bank stock		1,056	0
Net change in non-PPP loans		(40,855)	(85,733)
Purchases of premises and equipment		(560)	(1,564)
Proceeds from sale or disposal of premises and equipment		0	1,222
Other investment activities		(3,078)	(618)
Net cash used in investing activities		(207,647)	(53,733)
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		(1,475)	5,925
Depreciation, amortization and accretion, net		2,261	1,211
Deferred income tax benefit		1,446	277
Gain on sale of mortgage loans held for sale		(1,196)	(769)
Origination of mortgage loans held for sale		(68,739)	(30,974)
Proceeds from sale of mortgage loans held for sale		85,903	32,350
Bank owned life insurance income	[1]	(161)	(179)
(Gain)/loss on the disposal of premises and equipment		0	(231)
Stock compensation expense		849	817
Excess tax (benefit) expense from share-based compensation arrangements		(1,009)	(60)
Net change in accrued interest receivable and other assets		3,710	(5,018)
Net change in accrued interest payable and other liabilities		(17,064)	(3,884)
Net cash provided by operating activities		27,235	12,697
Cash flows from financing activities:
Net change in deposits		211,320	64,920
Net change in securities sold under agreements to repurchase and federal funds purchased		880	(669)
Proceeds from Federal Home Loan Bank advances		10,000	30,000
Repayments of Federal Home Loan Bank advances		(17,486)	(40,824)
Share repurchases related to compensation plans		(3,093)	(1,485)
Cash dividends paid		(6,173)	(6,119)
Net cash provided by financing activities		195,448	45,823
Net change in cash and cash equivalents		15,036	4,787
Beginning cash and cash equivalents		317,945	249,724
Ending cash and cash equivalents		332,981	254,511
Supplemental cash flow information:
Interest paid		1,835	4,657
Income taxes paid, net of refunds		(105)	0
Cash paid for operating lease liabilities		520	485
Supplemental non-cash activity:
Unfunded commitments in tax credit investments		6,109	5,503
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]
Cash flows from operating activities:
Net change in PPP loans		$ (62,699)	$ 0

[1] Outside of the scope of ASC 606.