Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income
Interest and fees on loans	$ 110,205	$ 75,220	$ 306,736	$ 214,486
Interest Income, Securities, Operating, Taxable	8,269	6,664	24,255	19,381
Nontaxable interest and dividends on securities	14	14	40	46
Interest on loans held for sale	456	61	527	110
Interest on federal funds sold and short-term investments	680	916	1,753	1,768
Total interest and dividend income	119,624	82,875	333,311	235,791
Interest expense
Interest on deposits	11,846	5,251	30,052	13,773
Interest on borrowings	3,180	1,390	10,117	4,145
Total interest expense	15,026	6,641	40,169	17,918
Net interest income	104,598	76,234	293,142	217,873
Provision for loan losses	0	1,075	2,000	3,575
Net interest income after provision for loan losses	104,598	75,159	291,142	214,298
Noninterest income
Deposit account fees	5,299	4,658	14,785	13,640
Interchange and ATM fees	6,137	4,947	16,447	13,889
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions	7,188	6,564	21,089	19,528
Mortgage banking income	3,968	1,222	8,184	3,130
Gain Realized on Life Insurance Policies	(434)	(1,463)	(434)	(1,463)
Increase in cash surrender value of life insurance policies	1,304	984	3,572	2,929
Loan level derivative income	2,739	392	4,312	1,547
Other noninterest income	4,747	3,034	13,174	8,888
Total noninterest income	31,816	23,264	81,997	65,014
Noninterest expenses
Salaries and employee benefits	39,432	31,095	111,401	92,483
Occupancy and equipment expenses	8,555	6,310	24,109	20,215
Data processing & facilities management	1,515	1,287	4,883	3,837
FDIC assessment	0	725	1,394	2,214
Advertising expense	1,417	1,395	3,912	3,684
Professional Fees	1,338	1,128	3,486	2,973
Amortization of Intangible Assets	1,567	507	3,996	1,670
Available-for-Sale Securities - Fixed Income Gross Realized Losses	0	0	1,462	0
Business Combination, Acquisition Related Costs	705	2,688	26,433	3,122
Software Maintenance	1,385	1,079	3,913	3,048
Other noninterest expenses	11,619	9,225	31,887	28,332
Total noninterest expenses	67,533	55,439	216,876	161,578
Income before income taxes	68,881	42,984	156,263	117,734
Provision for income taxes	17,036	9,969	38,565	26,046
Net income	$ 51,845	$ 33,015	$ 117,698	$ 91,688
Basic earnings per share (in dollars per share)	$ 1.51	$ 1.20	$ 3.65	$ 3.33
Diluted earnings per share (in dollars per share)	$ 1.51	$ 1.20	$ 3.64	$ 3.32
Weighted average common shares (basic) (in shares)	34,361,176	27,537,841	32,283,196	27,517,210
Common shares equivalents (in shares)	39,390	63,499	45,416	62,596
Weighted average common shares (diluted) (in shares)	34,400,566	27,601,340	32,328,612	27,579,806
Retained Earnings [Member]
Noninterest expenses
Net income	$ 51,845	$ 33,015	$ 117,698	$ 91,688
Cash dividends declared per common share (in dollars per share)	$ 0.44	$ 0.38	$ 1.32	$ 1.14