Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest income
Interest and fees on loans	$ 90,112	$ 110,205	$ 280,768	$ 306,736
Interest Income, Securities, Operating, Taxable	7,218	8,269	23,006	24,255
Nontaxable interest and dividends on securities	9	14	27	40
Interest on loans held for sale	326	456	917	527
Interest on federal funds sold and short-term investments	254	680	546	1,753
Total interest and dividend income	97,919	119,624	305,264	333,311
Interest expense
Interest on deposits	5,432	11,846	23,351	30,052
Interest on borrowings	1,604	3,180	5,628	10,117
Total interest expense	7,036	15,026	28,979	40,169
Net interest income	90,883	104,598	276,285	293,142
Provision for credit losses	7,500	0	52,500	2,000
Net interest income after provision for credit losses	83,383	104,598	223,785	291,142
Noninterest income
Deposit account fees	3,428	5,299	11,227	14,785
Interchange and ATM fees	3,044	6,137	13,154	16,447
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions	7,571	7,188	21,696	21,089
Mortgage banking income	7,704	3,968	13,570	8,184
Bank Owned Life Insurance Income	1,314	1,304	3,902	3,572
Gain Realized on Life Insurance Policies	0	(434)	(692)	(434)
Loan level derivative income	2,457	2,739	8,918	4,312
Other noninterest income	3,829	4,747	10,813	13,174
Total noninterest income	29,347	31,816	83,972	81,997
Noninterest expenses
Salaries and employee benefits	38,409	39,432	113,027	111,401
Occupancy and equipment expenses	9,273	8,555	27,863	24,109
Data processing & facilities management	1,567	1,515	4,684	4,883
FDIC assessment	1,034	0	1,537	1,394
Advertising expense	1,215	1,417	3,107	3,912
Professional Fees	1,305	1,338	4,244	3,486
Amortization of Intangible Assets	1,428	1,567	4,392	3,996
Available-for-Sale Securities - Fixed Income Gross Realized Losses	0	0	0	1,462
Loss on Contract Termination	684	0	684	0
Business Combination, Acquisition Related Costs	0	705	0	26,433
Software Maintenance	1,753	1,385	5,218	3,913
Other noninterest expenses	9,990	11,619	35,349	31,887
Total noninterest expenses	66,658	67,533	200,105	216,876
Income before income taxes	46,072	68,881	107,652	156,263
Current Federal, State and Local, Tax Expense (Benefit)	11,199	17,036	21,126	38,565
Net income	$ 34,873	$ 51,845	$ 86,526	$ 117,698
Basic earnings per share (in dollars per share)	$ 1.06	$ 1.51	$ 2.59	$ 3.65
Diluted earnings per share (in dollars per share)	$ 1.06	$ 1.51	$ 2.59	$ 3.64
Weighted average common shares (basic) (in shares)	32,951,918	34,361,176	33,358,879	32,283,196
Common shares equivalents (in shares)	24,758	39,390	27,871	45,416
Weighted average common shares (diluted) (in shares)	32,976,676	34,400,566	33,386,750	32,328,612
Retained Earnings [Member]
Noninterest expenses
Net income	$ 34,873	$ 51,845	$ 86,526	$ 117,698
Cash dividends declared per common share (in dollars per share)	$ 0.46	$ 0.44	$ 1.38	$ 1.32