Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loss on Contract Termination	$ 684,000	$ 0	$ 0
Operating Lease, Impairment Loss	4,163,000	0	0
Gain (Loss) on Sale of Other Investments	1,033,000	0	0
Interest income
Interest and fees on loans	369,836,000	411,460,000	294,293,000
Interest Income, Securities, Operating, Taxable	30,133,000	32,405,000	26,513,000
Nontaxable interest and dividends on securities	35,000	51,000	60,000
Interest on loans held for sale	1,218,000	891,000	159,000
Interest on federal funds sold and short-term investments	847,000	2,207,000	2,676,000
Total interest and dividend income	402,069,000	447,014,000	323,701,000
Interest expense
Interest on deposits	27,333,000	41,186,000	19,995,000
Interest on borrowings	7,008,000	12,693,000	5,541,000
Total interest expense	34,341,000	53,879,000	25,536,000
Net interest income	367,728,000	393,135,000	298,165,000
Provision for Loan and Lease Losses	52,500,000	6,000,000	4,775,000
Net interest income after provision for credit losses	315,228,000	387,135,000	293,390,000
Noninterest income
Deposit account fees	15,121,000	20,040,000	18,327,000
Interchange and ATM fees	15,834,000	22,152,000	18,916,000
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions	29,432,000	28,719,000	26,155,000
Fees and Commission Mortgage Banking	18,948,000	11,454,000	4,071,000
Increase in cash surrender value of life insurance policies	5,362,000	5,013,000	4,060,000
Gain Realized on Life Insurance Policies	1,044,000	434,000	1,463,000
Derivative, Gain (Loss) on Derivative, Net	10,058,000	6,478,000	2,373,000
Other noninterest income	15,641,000	21,004,000	13,140,000
Total noninterest income	111,440,000	115,294,000	88,505,000
Noninterest expenses
Salaries and employee benefits	152,460,000	149,165,000	124,328,000
Occupancy and equipment expenses	37,050,000	33,207,000	27,098,000
Data processing & facilities management	6,265,000	6,516,000	5,125,000
FDIC assessment	2,522,000	1,394,000	2,774,000
Advertising expense	4,258,000	5,444,000	4,942,000
Consulting expense	5,987,000	5,448,000	3,891,000
Cost, Amortization	5,802,000	5,545,000	2,344,000
Available-for-Sale Securities - Fixed Income Gross Realized Losses	0	1,462,000	0
Merger and acquisition expense	0	26,433,000	11,168,000
Software Maintenance	7,264,000	5,511,000	4,202,000
Other noninterest expenses	46,344,000	44,196,000	40,097,000
Total noninterest expenses	273,832,000	284,321,000	225,969,000
Income before income taxes	152,836,000	218,108,000	155,926,000
Income tax benefit	31,669,000	52,933,000	34,304,000
Net Income	$ 121,167,000	$ 165,175,000	$ 121,622,000
Basic earnings per share (in dollars per share)	$ 3.64	$ 5.03	$ 4.41
Diluted earnings per share (in dollars per share)	$ 3.64	$ 5.03	$ 4.40
Weighted average common shares (basic) (in shares)	33,259,643	32,810,433	27,592,380
Common share equivalents (in shares)	25,646	45,801	61,428
Weighted average common shares (diluted) (in shares)	33,285,289	32,856,234	27,653,808
Retained Earnings
Noninterest expenses
Net Income	$ 121,167,000	$ 165,175,000	$ 121,622,000
Cash dividends declared (in dollars per share)	$ 1.84	$ 1.76	$ 1.52