Consolidated Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities:
Net income		$ 125,419,000	$ 117,655,000	$ 64,814,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment, and amortization		6,012,000	6,363,000	6,453,000
Amortization of intangible assets		6,334,000	5,464,000	5,724,000
Provision for (benefit from) credit losses		18,470,000	(6,775,000)	42,813,000
Amortization of investment securities premium, net		6,641,000	6,685,000	2,669,000
Gain on sale of investment securities		0	0	(7,000)
Originations of loans for resale		(71,600,000)	(217,210,000)	(227,831,000)
Proceeds from sale of loans originated for resale		74,922,000	227,938,000	234,424,000
Gain on sale of loans		(2,342,000)	(9,580,000)	(9,122,000)
Change in market value of mortgage servicing rights		(301,000)	872,000	2,634,000
(Gain) loss on sale of real estate owned real estate owned		(166,000)	0	128,000
Deferred income tax expense		(8,022,000)	(936,000)	(14,154,000)
Gain on transfer of loans to real estate owned		(316,000)	(233,000)	(235,000)
Operating lease payments		(5,904,000)	(4,964,000)	(4,927,000)
(Gain) loss on disposal of fixed assets		(1,070,000)	(439,000)	67,000
Increase in cash value of life insurance		(2,858,000)	(2,775,000)	(2,949,000)
Gain on life insurance death benefit		(309,000)	(702,000)	(498,000)
(Gain) loss on marketable equity securities		340,000	86,000	(64,000)
Equity compensation vesting expense		3,869,000	2,638,000	2,036,000
Change in value of other real estate		113,000	9,000	0
Change in:
Interest receivable		(9,170,000)	712,000	(1,107,000)
Interest payable		(287,000)	(434,000)	(1,045,000)
Amortization of operating lease right of use asset		6,033,000	5,452,000	5,393,000
Other assets and liabilities, net		17,087,000	2,381,000	9,586,000
Net cash from operating activities		162,895,000	132,207,000	114,802,000
Investing activities:
Cash acquired in acquisition; net of consideration paid		426,883,000	0	0
Proceeds from maturities of securities available for sale		267,830,000	371,632,000	167,515,000
Proceeds from maturities of securities held to maturity		38,399,000	83,929,000	89,858,000
Proceeds from sale of available for sale securities		0	0	229,000
Purchases of securities available for sale		(699,035,000)	(1,190,690,000)	(617,552,000)
Net redemption of restricted equity securities		0	0	0
Loan origination and principal collections, net		(739,037,000)	(45,812,000)	(415,415,000)
Loans purchased		(22,845,000)	(108,433,000)	(41,126,000)
Proceeds from sale of real estate owned		873,000	1,526,000	570,000
Proceeds from sale of premises and equipment		6,690,000	2,743,000	0
Purchases of premises and equipment		(3,623,000)	(3,196,000)	(2,812,000)
Life insurance proceeds		641,000	4,490,000	2,400,000
Net cash from investing activities		(723,224,000)	(883,811,000)	(816,333,000)
Financing activities:
Net change in deposits		(253,625,000)	861,225,000	1,138,940,000
Net change in other borrowings		214,518,000	23,173,000	8,460,000
Repurchase of common stock, net		(27,148,000)	(4,344,000)	(26,720,000)
Dividends paid		(35,797,000)	(29,724,000)	(26,303,000)
Exercise of stock options, net		1,190,000	144,000	198,000
Net cash from financing activities		(100,862,000)	850,474,000	1,094,575,000
Net change in cash and cash equivalents		(661,191,000)	98,870,000	393,044,000
Cash and cash equivalents at beginning of year		768,421,000	669,551,000	276,507,000
Cash and cash equivalents at end of year		107,230,000	768,421,000	669,551,000
Supplemental disclosure of cash flow activity:
Cash paid for interest expense		9,290,000	5,942,000	10,502,000
Cash paid for income taxes		41,000,000	46,300,000	29,500,000
Supplemental disclosure of noncash activities:
Unrealized gain (loss) on securities available for sale		(290,157,000)	(19,575,000)	15,796,000
Loans transferred to foreclosed assets		1,349,000	1,052,000	766,000
Market value of shares tendered in-lieu of cash to pay for exercise of options and/or related taxes		2,522,000	2,118,000	736,000
Obligations incurred in conjunction with leased assets		6,149,000	2,883,000	4,161,000
Business combination	[1]

[1] (1) In the year ended 2022, the VRB acquisition included fair value tangible assets acquired of $1.37 billion, liabilities assumed of $1.28 billion, resulting in goodwill of $0.09 billion.