Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest income
Interest and fees on loans	$ 91,634	$ 112,923	$ 190,656	$ 196,531
Interest Income, Securities, Operating, Taxable	7,831	8,521	15,788	15,986
Nontaxable interest and dividends on securities	9	13	18	26
Interest on loans held for sale	359	40	591	71
Interest on federal funds sold and short-term investments	132	647	292	1,073
Total interest and dividend income	99,965	122,144	207,345	213,687
Interest expense
Interest on deposits	7,027	11,178	17,919	18,206
Interest on borrowings	1,840	4,947	4,024	6,937
Total interest expense	8,867	16,125	21,943	25,143
Net interest income	91,098	106,019	185,402	188,544
Provision for credit losses	20,000	1,000	45,000	2,000
Net interest income after provision for credit losses	71,098	105,019	140,402	186,544
Noninterest income
Deposit account fees	2,829	5,080	7,799	9,486
Interchange and ATM fees	5,214	5,794	10,110	10,310
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions	7,296	7,153	14,125	13,901
Mortgage banking income	5,005	3,410	5,866	4,216
Bank Owned Life Insurance Income	1,312	1,296	2,588	2,268
Gain Realized on Life Insurance Policies	(335)	0	(692)	0
Loan level derivative income	2,864	932	6,461	1,573
Available-for-sale Equity Securities, Gross Unrealized Gain	1,386	441	1,386	1,345
Other noninterest income	1,949	4,542	5,598	7,082
Total noninterest income	28,190	28,648	54,625	50,181
Noninterest expenses
Salaries and employee benefits	37,269	38,852	74,618	71,969
Occupancy and equipment expenses	9,273	8,424	18,590	15,554
Data processing & facilities management	1,459	2,042	3,117	3,368
FDIC assessment	503	778	503	1,394
Advertising expense	787	1,282	1,892	2,495
Professional Fees	1,603	1,384	2,939	2,148
Amortization of Intangible Assets	1,433	1,572	2,964	2,429
Available-for-Sale Securities - Fixed Income Gross Realized Losses	0	1,462	0	1,462
Business Combination, Acquisition Related Costs	0	24,696	0	25,728
Software Maintenance	1,780	1,363	3,465	2,528
Other noninterest expenses	12,500	11,177	25,359	20,268
Total noninterest expenses	66,607	93,032	133,447	149,343
Income before income taxes	32,681	40,635	61,580	87,382
Current Federal, State and Local, Tax Expense (Benefit)	7,779	10,007	9,927	21,529
Net income	$ 24,902	$ 30,628	$ 51,653	$ 65,853
Basic earnings per share (in dollars per share)	$ 0.76	$ 0.89	$ 1.54	$ 2.11
Diluted earnings per share (in dollars per share)	$ 0.76	$ 0.89	$ 1.54	$ 2.11
Weighted average common shares (basic) (in shares)	32,944,761	34,313,492	33,564,596	31,226,985
Common shares equivalents (in shares)	28,098	41,878	31,991	48,381
Weighted average common shares (diluted) (in shares)	32,972,859	34,355,370	33,596,587	31,275,366
Retained Earnings [Member]
Noninterest expenses
Net income	$ 24,902	$ 30,628	$ 51,653	$ 65,853
Cash dividends declared per common share (in dollars per share)	$ 0.46	$ 0.44	$ 0.92	$ 0.88