Consolidated Statements of Income - USD ($) shares in Thousands		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Interest income:
Loans, including fees		$ 302,044,000		$ 216,138,000	$ 164,073,000
Federal funds sold and interest bearing due from banks		8,411,000		6,018,000	645,000
Mortgage loans held for sale		211,000		190,000	249,000
Federal Home Loan Bank stock		1,560,000		505,000	262,000
Investment securities:
Taxable		32,706,000		27,302,000	11,575,000
Tax-exempt		1,764,000		1,499,000	272,000
Total interest income		346,696,000		251,652,000	177,076,000
Interest expense:
Deposits		81,585,000		16,412,000	5,627,000
Securities sold under agreements to repurchase		2,087,000		567,000	24,000
Federal funds purchased and other short-term borrowing		689,000		154,000	14,000
Federal Home Loan Bank advances		12,768,000		12,000	337,000
Subordinated debentures		2,235,000		1,124,000	0
Total interest expense		99,364,000		18,269,000	6,002,000
Net interest income		247,332,000		233,383,000	171,074,000
Provision for credit losses		13,796,000		10,257,000	(753,000)
Net interest income after provision expense		233,536,000		223,126,000	171,827,000
Non-interest income:
Mortgage banking income	[1]	3,705,000		3,210,000	4,724,000
Loss on sale of securities AFS debt securities		(44,000)	[1]	0	0
Bank owned life insurance	[1]	2,253,000		1,597,000	914,000
Gain (loss) on sale of premises and equipment	[1]	(30,000)		4,341,000	(78,000)
Total non-interest income		92,220,000		89,149,000	65,850,000
Non-interest expenses:
Compensation		91,876,000		86,640,000	63,034,000
Employee benefits		18,451,000		16,568,000	13,479,000
Net occupancy and equipment		16,384,000		14,298,000	9,688,000
Technology and communication		17,318,000		14,897,000	11,145,000
Debit and credit card processing		6,481,000		5,909,000	4,494,000
Marketing and business development		5,990,000		5,005,000	4,150,000
Postage, printing and supplies		3,604,000		3,354,000	2,213,000
Legal and professional		3,958,000		2,943,000	2,583,000
FDIC insurance		3,911,000		2,758,000	1,847,000
Amortization of investments in tax credit partnerships		1,294,000		353,000	367,000
Capital and deposit based taxes		2,476,000		2,621,000	2,090,000
Merger expenses		0		19,500,000	19,025,000
Federal Home Loans Bank early termination penalty		0		0	474,000
Intangible amortization		4,686,000		5,544,000	770,000
Loss on disposition of LFA		0		870,000	0
Other		11,400,000		10,531,000	6,921,000
Total non-interest expenses		187,829,000		191,791,000	142,280,000
Income before income tax expense		137,927,000		120,484,000	95,397,000
Income tax expense		30,179,000		27,190,000	20,752,000
Net income		107,748,000		93,294,000	74,645,000
Less net income attributed to non-controlling interest		0		322,000	0
Net income available to stockholders		$ 107,748,000		$ 92,972,000	$ 74,645,000
Net income per share - basic (in dollars per share)		$ 3.69		$ 3.24	$ 3
Net income per share - diluted (in dollars per share)		$ 3.67		$ 3.21	$ 2.97
Weighted average outstanding shares:
Basic (in shares)		29,212		28,672	24,898
Diluted (in shares)		29,343		28,922	25,156
Fiduciary and Trust [Member]
Non-interest income:
Non-interest income		$ 39,802,000		$ 36,111,000	$ 27,613,000
Deposit Account [Member]
Non-interest income:
Non-interest income		8,866,000		8,286,000	5,852,000
Credit and Debit Card [Member]
Non-interest income:
Non-interest income		19,438,000		18,623,000	13,456,000
Treasury Management [Member]
Non-interest income:
Non-interest income		10,033,000		8,590,000	6,912,000
Investment Advisory, Management and Administrative Service [Member]
Non-interest income:
Non-interest income		3,205,000		3,063,000	2,553,000
Product and Service, Other [Member]
Non-interest income:
Non-interest income		$ 4,992,000		$ 5,328,000	$ 3,904,000

[1] Outside of the scope of ASC 606.