Consolidated Statements of Income - USD ($)		12 Months Ended
		Dec. 31, 2024		Dec. 31, 2023	Dec. 31, 2022
Interest income
Interest and fees on loans and leases		$ 383,308,000		$ 347,918,000	$ 237,156,000
Interest and dividends on investment securities:
Taxable		14,909,000		14,225,000	11,432,000
Exempt from federal income taxes		33,000		58,000	58,000
Interest on deposits with other banks		11,193,000		6,660,000	1,920,000
Interest and dividends on other earning assets		2,912,000		2,869,000	1,627,000
Total interest income		412,355,000		371,730,000	252,193,000
Interest expense
Interest on demand deposits		113,074,000		87,821,000	18,845,000
Interest on savings deposits		3,529,000		3,249,000	1,269,000
Interest on time deposits		64,266,000		34,979,000	5,308,000
Interest on short-term borrowings		249,000		7,095,000	1,389,000
Interest on long-term debt and subordinated notes		20,067,000		18,589,000	7,085,000
Total interest expense		201,185,000		151,733,000	33,896,000
Net interest income (expense)	[1]	211,170,000		219,997,000	218,297,000
Provision for credit losses		5,933,000		10,770,000	12,198,000
Net interest income after provision for credit losses		205,237,000		209,227,000	206,099,000
Disaggregation of Revenue [Line Items]
Insurance commission and fee income		22,349,000		21,043,000	19,065,000
Bank owned life insurance income	[1]	3,861,000		3,185,000	3,787,000
Net gain on sales of investment securities		18,000	[1]	0	30,000	[1]
Net gain on mortgage banking activities	[1]	5,265,000		3,689,000	4,412,000
Other income	[2]	4,034,000		2,882,000	4,500,000
Total noninterest income		88,055,000		76,824,000	77,885,000
Noninterest expense
Salaries, benefits and commissions		123,745,000		120,188,000	115,806,000
Net occupancy		11,025,000		10,686,000	10,193,000
Equipment		4,453,000		4,132,000	3,904,000
Data processing		16,956,000		16,799,000	15,215,000
Professional fees		6,402,000		7,141,000	9,332,000
Marketing and advertising		2,173,000		2,180,000	2,462,000
Deposit insurance premiums		4,432,000		4,825,000	3,075,000
Intangible expenses		694,000		938,000	1,293,000
Restructuring charges		0		1,519,000	184,000
Other expense		28,112,000		28,954,000	25,310,000
Total noninterest expense		197,992,000		197,362,000	186,774,000
Income before income taxes		95,300,000		88,689,000	97,210,000
Income tax expense		19,369,000		17,585,000	19,090,000
Net income		$ 75,931,000		$ 71,104,000	$ 78,120,000
Net income per share:
Basic (in dollars per share)		$ 2.60		$ 2.42	$ 2.66
Diluted (in dollars per share)		$ 2.58		$ 2.41	$ 2.64
Trust fee income
Disaggregation of Revenue [Line Items]
Noninterest income		$ 8,491,000		$ 7,732,000	$ 7,743,000
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income		8,082,000		7,048,000	6,175,000
Investment advisory commission and fee income
Disaggregation of Revenue [Line Items]
Noninterest income		21,208,000		18,864,000	19,748,000
Other service fee income
Disaggregation of Revenue [Line Items]
Noninterest income	[2]	$ 14,747,000		$ 12,381,000	$ 12,425,000

[1] Net interest income as well as many other revenues for financial assets and liabilities including loans, leases, securities, and derivatives are excluded from the scope of FASB ASC 606 "Revenue from Contracts with Customers" ("FASB ASC 606"). Noninterest income streams that are out of scope of FASB ASC 606 include bank owned life insurance income, sales of investment securities and mortgage banking activities.

[2] Other service fee income and other income include certain items that are in scope and certain items that are out of scope of FASB ASC 606 as described further in the following paragraphs.