Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loss on Contract Termination	$ 0	$ 684,000	$ 0
Operating Lease, Impairment Loss	0	4,163,000	0
Gain (Loss) on Sale of Other Investments	0	(1,033,000)	0
Interest income
Interest and fees on loans	381,433,000	369,836,000	411,460,000
Interest Income, Securities, Operating, Taxable	30,477,000	30,133,000	32,405,000
Nontaxable interest and dividends on securities	16,000	35,000	51,000
Interest on loans held for sale	856,000	1,218,000	891,000
Interest on federal funds sold and short-term investments	2,494,000	847,000	2,207,000
Total interest and dividend income	415,276,000	402,069,000	447,014,000
Interest expense
Interest on deposits	8,327,000	27,333,000	41,186,000
Interest on borrowings	5,390,000	7,008,000	12,693,000
Total interest expense	13,717,000	34,341,000	53,879,000
Net interest income	401,559,000	367,728,000	393,135,000
Provision for Loan and Lease Losses	18,205,000	52,500,000	6,000,000
Net interest income after provision for credit losses	383,354,000	315,228,000	387,135,000
Noninterest income
Deposit account fees	16,745,000	15,121,000	20,040,000
Interchange and ATM fees	12,987,000	15,834,000	22,152,000
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions	35,308,000	29,432,000	28,719,000
Fees and Commission Mortgage Banking	13,280,000	18,948,000	11,454,000
Increase in cash surrender value of life insurance policies	6,431,000	5,362,000	5,013,000
Gain Realized on Life Insurance Policies	258,000	1,044,000	434,000
Derivative, Gain (Loss) on Derivative, Net	3,257,000	10,058,000	6,478,000
Other noninterest income	17,584,000	15,641,000	21,004,000
Total noninterest income	105,850,000	111,440,000	115,294,000
Noninterest expenses
Salaries and employee benefits	172,586,000	152,460,000	149,165,000
Occupancy and equipment expenses	36,265,000	37,050,000	33,207,000
Data processing & facilities management	6,899,000	6,265,000	6,516,000
FDIC assessment	3,980,000	2,522,000	1,394,000
Advertising expense	4,085,000	4,258,000	5,444,000
Consulting expense	8,271,000	5,987,000	5,448,000
Cost, Amortization	5,715,000	6,135,000	6,379,000
Debit Card Expense	5,144,000	4,374,000	4,220,000
Available-for-Sale Securities - Fixed Income Gross Realized Losses	0	0	1,462,000
Merger and acquisition expense	40,840,000		26,433,000
Software Maintenance	8,149,000	7,264,000	5,511,000
Other noninterest expenses	40,595,000	41,637,000	39,142,000
Total noninterest expenses	332,529,000	273,832,000	284,321,000
Income before income taxes	156,675,000	152,836,000	218,108,000
Income tax benefit	35,683,000	31,669,000	52,933,000
Net Income	$ 120,992,000	$ 121,167,000	$ 165,175,000
Basic earnings per share (in dollars per share)	$ 3.47	$ 3.64	$ 5.03
Diluted earnings per share (in dollars per share)	$ 3.47	$ 3.64	$ 5.03
Weighted average common shares (basic) (in shares)	34,872,034	33,259,643	32,810,433
Common share equivalents (in shares)	16,484	25,646	45,801
Weighted average common shares (diluted) (in shares)	34,888,518	33,285,289	32,856,234
Retained Earnings
Noninterest expenses
Net Income	$ 120,992,000	$ 121,167,000	$ 165,175,000
Cash dividends declared (in dollars per share)	$ 1.92	$ 1.84	$ 1.76