Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Income
Interest and fees on loans	$ 170,012	$ 142,055	$ 125,752
Interest on investment securities:
Taxable	23,389	17,337	14,387
Tax-exempt	2,967	2,843	2,706
Interest Income, Deposits with Financial Institutions	1,332	1,666	85
Total Interest Income	197,700	163,901	142,930
Interest Expense
Interest on deposits	32,666	21,397	14,826
Interest on short-term borrowings	3,491	3,415	1,214
Interest on long-term debt	182	880	765
Total Interest Expense	36,339	25,692	16,805
Net Interest Income	161,361	138,209	126,125
(Recovery of) provision for loan losses	(1,250)	(2,310)	3,006
Net Interest Income After (Recovery of) Provision for Loan Losses	162,611	140,519	123,119
Non-Interest Income
Net gains on sale of investment securities	69	0	4,476
Equity Securities, FV-NI, Unrealized Gain (Loss)	888	(90)	0
Revenue from Contract with Customer, Including Assessed Tax	63,767	57,453
Bank owned life insurance	3,766	3,090	4,212
Other income	4,000	2,962	2,956
Total Non-Interest Income	68,490	60,564	63,607
Non-Interest Expense
Salaries and employee benefits	62,138	54,385	51,057
Occupancy related expenses	10,595	9,323	9,557
Equipment and software related expenses	8,964	7,729	7,732
FDIC insurance expense	638	1,251	1,348
Advertising	3,344	2,974	2,914
Bankcard expenses	5,555	4,503	3,924
Postage, delivery, and statement mailings	2,416	2,157	2,094
Office supplies	1,559	1,319	1,437
Legal and professional fees	2,371	1,847	1,956
Telecommunications	2,455	1,750	1,988
Repossessed asset losses, net of expenses	634	845	735
Merger related costs	797	13,257	0
Other expenses	16,148	11,726	11,239
Total Non-Interest Expense	117,614	113,066	95,981
Income Before Income Taxes	113,487	88,017	90,745
Income tax expense	24,135	18,015	36,435
Net Income Available to Common Shareholders	$ 89,352	$ 70,002	$ 54,310
Average shares outstanding, basic	16,314	15,421	15,412
Effect of dilutive securities	19	18	24
Average shares outstanding, diluted	16,333	15,439	15,436
Basic earnings per common share	$ 5.43	$ 4.50	$ 3.49
Diluted earnings per common share	$ 5.42	$ 4.49	$ 3.48
Deposit Account [Member]
Non-Interest Income
Revenue from Contract with Customer, Including Assessed Tax	$ 31,515	$ 29,704	$ 28,574
Debit Card [Member]
Non-Interest Income
Revenue from Contract with Customer, Including Assessed Tax	21,093	18,369	17,120
Fiduciary and Trust [Member]
Non-Interest Income
Revenue from Contract with Customer, Including Assessed Tax	$ 7,159	$ 6,529	$ 6,269