Consolidated Condensed Statements Of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest and dividend income:
Interest and fees on loans	$ 82,471	$ 64,496	$ 154,474	$ 128,898
Interest and dividends on:
Obligations of U.S. Government, its agencies and other securities	6,919	7,746	13,914	14,513
Interest Income, Securities, State and Municipal	2,308	2,178	4,525	4,352
Other interest income	528	271	1,169	642
Total interest and dividend income	92,226	74,691	174,082	148,405
Interest on deposits:
Demand and savings deposits	8,811	4,107	15,904	7,397
Time deposits	4,357	2,886	8,134	5,437
Interest on borrowings:
Short-term borrowings	760	420	1,499	995
Long-term debt	2,447	2,536	4,918	4,984
Total interest expense	16,375	9,949	30,455	18,813
Net interest income	75,851	64,742	143,627	129,592
Provision for loan losses	1,919	1,386	4,417	1,646
Net interest income after provision for loan losses	73,932	63,356	139,210	127,946
Noninterest Income [Abstract]
Debit card fee income	5,227	4,382	9,596	8,384
Bank owned life insurance income	1,286	1,031	2,292	2,040
ATM Fees	460	510	900	1,034
OREO valuation adjustments	(55)	(114)	(82)	(321)
Gain on sale of OREO, net	(159)	(147)	(171)	4,174
Gain (Loss) on Sale of Investments	(607)	0	(607)	(2,271)
Gain on equity securities, net	232	1,348	1,974	4,544
Other components of net periodic benefit income	1,183	1,705	2,366	3,410
Other	1,611	1,563	2,835	2,698
Total other income	22,808	23,242	44,833	50,145
Other expense:
Salaries and employee benefits	32,093	24,103	57,898	49,423
Employee Benefits and Share-based Compensation	9,014	7,630	17,444	14,659
Occupancy expense	3,223	2,570	6,234	5,506
Furniture and equipment expense	4,386	4,013	8,536	8,162
Data processing fees	2,905	1,902	5,038	3,675
Professional fees and services	10,106	6,123	16,112	12,313
Marketing	1,455	1,185	2,681	2,403
Insurance	1,381	1,196	2,537	2,624
Communication	1,375	1,189	2,708	2,439
Excise and Sales Taxes	1,054	958	2,059	2,063
Amortization of Intangible Assets	702	0	991	0
Other expense	2,498	1,665	4,781	3,575
Total other expense	70,192	52,534	127,019	106,842
Income before income taxes	26,548	34,064	57,024	71,249
Income taxes	4,385	5,823	9,406	11,885
Net income	22,163	28,241	47,618	59,364
Net income available to common shareholders	$ 22,163	$ 28,241	$ 47,618	$ 59,364
Net income available to common shareholders
Basic	$ 1.34	$ 1.85	$ 2.96	$ 3.88
Diluted	$ 1.33	$ 1.83	$ 2.94	$ 3.85
Weighted average common shares outstanding
Basic	16,560,545	15,285,532	16,106,043	15,286,932
Diluted	16,642,571	15,417,607	16,193,643	15,424,585
Cash dividends declared	$ 1.01	$ 1.21	$ 2.22	$ 2.15
Fiduciary and Trust [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	$ 6,935	$ 6,666	$ 13,658	$ 13,061
Deposit Account [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	2,655	2,826	5,214	5,748
Bank Servicing [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	$ 4,040	$ 3,472	$ 6,858	$ 7,644