Consolidated Statements of Income - USD ($)		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Interest income
Interest and fees on loans and leases		$ 347,918,000	$ 237,156,000		$ 201,347,000
Interest and dividends on investment securities:
Taxable		14,225,000	11,432,000		6,136,000
Exempt from federal income taxes		58,000	58,000		170,000
Interest on deposits with other banks		6,660,000	1,920,000		661,000
Interest and dividends on other earning assets		2,869,000	1,627,000		1,417,000
Total interest income		371,730,000	252,193,000		209,731,000
Interest expense
Interest on demand deposits		87,821,000	18,845,000		5,581,000
Interest on savings deposits		3,249,000	1,269,000		1,114,000
Interest on time deposits		34,979,000	5,308,000		6,178,000
Interest on short-term borrowings		7,095,000	1,389,000		8,000
Interest on long-term debt and subordinated notes		18,589,000	7,085,000		8,467,000
Total interest expense		151,733,000	33,896,000		21,348,000
Net interest income (expense)	[1]	219,997,000	218,297,000		188,383,000
Provision (reversal of provision) for credit losses		10,770,000	12,198,000		(10,132,000)
Net interest income after provision for credit losses		209,227,000	206,099,000		198,515,000
Disaggregation of Revenue [Line Items]
Insurance commission and fee income		21,043,000	19,065,000		16,357,000
Bank owned life insurance income	[1]	3,185,000	3,787,000		3,981,000
Net gain on sales of investment securities		0	30,000	[1]	145,000	[1]
Net gain on mortgage banking activities	[1]	3,689,000	4,412,000		15,141,000
Other income	[2]	2,882,000	4,500,000		4,482,000
Total noninterest income		76,824,000	77,885,000		83,224,000
Noninterest expense
Salaries, benefits and commissions		120,188,000	115,806,000		104,191,000
Net occupancy		10,686,000	10,193,000		10,397,000
Equipment		4,132,000	3,904,000		3,899,000
Data processing		16,799,000	15,215,000		12,743,000
Professional fees		7,141,000	9,332,000		7,687,000
Marketing and advertising		2,180,000	2,462,000		2,063,000
Deposit insurance premiums		4,825,000	3,075,000		2,712,000
Intangible expenses		938,000	1,293,000		979,000
Restructuring charges		1,519,000	184,000		0
Other expense		28,954,000	25,310,000		22,738,000
Total noninterest expense		197,362,000	186,774,000		167,409,000
Income before income taxes		88,689,000	97,210,000		114,330,000
Income tax expense		17,585,000	19,090,000		22,529,000
Net income (loss)		$ 71,104,000	$ 78,120,000		$ 91,801,000
Net income per share:
Basic (in dollars per share)		$ 2.42	$ 2.66		$ 3.12
Diluted (in dollars per share)		$ 2.41	$ 2.64		$ 3.11
Trust fee income
Disaggregation of Revenue [Line Items]
Noninterest income		$ 7,732,000	$ 7,743,000		$ 8,403,000
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income		7,048,000	6,175,000		5,504,000
Investment advisory commission and fee income
Disaggregation of Revenue [Line Items]
Noninterest income		18,864,000	19,748,000		18,936,000
Other service fee income
Disaggregation of Revenue [Line Items]
Noninterest income	[2]	$ 12,381,000	$ 12,425,000		$ 10,275,000

[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.