CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest and dividend income:
Interest and fees on loans		$ 574,871	$ 612,115	$ 469,856
Interest on deposits in other banks		1,270	3,733	2,125
Interest and dividends on securities:
Taxable		43,585	51,437	36,851
Nontaxable		33,728	32,047	19,956
Total interest and dividend income		653,454	699,332	528,788
Interest expense:
Interest on deposits		75,943	114,972	59,336
Interest on short-term borrowings		1,691	15,479	18,458
Interest on long-term borrowings		20,522	31,009	24,303
Total interest expense		98,156	161,460	102,097
Net interest income		555,298	537,872	426,691
Provision for credit losses		87,141	21,092	13,736
Net interest income after provision for credit losses		468,157	516,780	412,955
Noninterest income:
Mortgage banking income		25,857	10,303	0
Gains on securities transactions	[1],[2]	12,294	7,675	383
Bank owned life insurance income		9,554	8,311	7,198
Loan-related interest rate swap fees		15,306	14,126	3,554
Gain on Shore Premier sale		0	0	19,966
Other operating income		6,098	17,791	7,145
Total noninterest income		131,486	132,815	104,241
Noninterest expenses:
Salaries and benefits		206,662	195,349	159,378
Occupancy expenses		28,841	29,793	25,368
Furniture and equipment expenses		14,923	14,216	11,991
Technology and data processing		25,929	23,686	18,397
Professional services		13,007	11,905	10,283
Marketing and advertising expense		9,886	11,566	10,043
FDIC assessment premiums and other insurance		9,971	6,874	6,644
Other taxes		16,483	15,749	11,542
Loan-related expenses		9,515	10,043	7,206
OREO and credit-related expenses		2,023	4,708	4,131
Amortization of intangible assets		16,574	18,521	12,839
Merger-related costs		0	27,824	39,728
Rebranding expense		0	6,455	0
Loss on debt extinguishment	[1],[2]	31,116	16,397	0
Other expenses		28,419	25,254	20,217
Total noninterest expenses		413,349	418,340	337,767
Income from continuing operations before income taxes		186,294	231,255	179,429
Income tax expense		28,066	37,557	30,016
Income from continuing operations		158,228	193,698	149,413
Discontinued operations:
Loss from operations of discontinued mortgage segment		0	(230)	(4,280)
Income tax benefit		0	(60)	(1,115)
Loss on discontinued operations		0	(170)	(3,165)
Net income	[1],[2]	158,228	193,528	146,248
Dividends on preferred stock		5,658	0	0
Net Income available to common shareholders		$ 152,570	$ 193,528	$ 146,248
Basic earnings per common share (in dollars per share)		$ 1.93	$ 2.41	$ 2.22
Diluted earnings per common share (in dollars per share)		1.93	2.41	2.22
Dividends declared per common share (in dollars per share)		$ 1.00	$ 0.96	$ 0.88
Weighted average shares outstanding, basic (in shares)		78,858,726	80,200,950	65,859,165
Diluted weighted average number of common shares outstanding (in shares)		78,875,668	80,263,557	65,908,573
Service charges on deposit accounts
Noninterest income:
Noninterest income		$ 25,251	$ 30,202	$ 25,439
Other service charges, commissions and fees
Noninterest income:
Noninterest income		6,292	6,423	5,603
Interchange fees
Noninterest income:
Noninterest income		7,184	14,619	18,803
Fiduciary and asset management fees
Noninterest income:
Noninterest income		$ 23,650	$ 23,365	$ 16,150

[1] Discontinued operations have an immaterial impact to the Company’s Consolidated Statements of Cash Flows. The change in goodwill impairment losses included in the Operating Activities section above are attributable to discontinued operations.

[2] Loans held for sale activity is included in the Operating Activities section above. Due to the increased mortgage related activity during 2020 and 2019, the loans held for sale activity is segregated between originations and purchases of loans held for sale and proceeds from sales of loans held for sale. 2018 loans held for sale activity is included in the change in loans held for sale and is attributable to discontinued operations which has an immaterial impact on the Company’s Consolidated Statements of Cash Flows.