Business Combinations - Consideration, Assets Acquired and Liabilities Assumed (Details) - USD ($)			12 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Dec. 31, 2021	Dec. 31, 2020
Fair Value of Assets Acquired
Adjustments, Loans			$ (6,700,000)	$ (8,600,000)
Goodwill			373,424,000	373,424,000
Fair Value of Liabilities Assumed
Goodwill			373,424,000	373,424,000
As Recorded by DNB
Fair Value of Assets Acquired
Cash and cash equivalents		$ 64,119,000
Securities and other investments		108,715,000
Loans		917,127,000
Allowance for credit losses		(6,487,000)
Goodwill		15,525,000
Premises and equipment		6,782,000
Accrued interest receivable		4,138,000
Deferred income taxes		2,017,000
Core deposits and other intangible assets		269,000
Other assets		24,883,000
Total Assets Acquired		1,137,088,000
Fair Value of Liabilities Assumed
Deposits		966,263,000
Borrowings		37,617,000
Accrued interest payable and other liabilities		11,157,000
Total Liabilities Assumed		1,015,037,000
Total Net Assets Acquired		122,051,000
Identifiable Intangible Assets		269,000
Goodwill		15,525,000
DNB
Fair Value of Assets Acquired
Cash and cash equivalents	$ 64,119,000	64,119,000
Securities and other investments	108,898,000	108,898,000
Adjustments, Securities and other investments		183,000
Loans	906,607,000	908,984,000
Adjustments, Loans	(2,377,000)	(8,143,000)
Allowance for credit losses	0	0
Adjustments, Allowance for credit losses		6,487,000
Goodwill	85,978,000	84,175,000		86,000,000
Adjustments, Goodwill	1,803,000	(15,525,000)
Premises and equipment	14,872,000	14,872,000
Adjustments, Premises and equipment	0	8,090,000
Accrued interest receivable	4,138,000	4,138,000
Deferred income taxes	(970,000)	(1,281,000)
Adjustments, Deferred income taxes	311,000	(3,298,000)
Core deposits and other intangible assets			6,900,000
Adjustments, Core deposits and other intangible assets		(269,000)
Other assets	20,489,000	20,605,000
Adjustments, Other assets	(116,000)	(4,278,000)
Total Assets Acquired	1,118,153,000	1,120,335,000
Adjustments, Total Assets Acquired	(2,182,000)	(16,753,000)
Fair Value of Liabilities Assumed
Deposits	967,265,000	967,265,000
Adjustments, Deposits		1,002,000
Borrowings	37,084,000	37,341,000
Adjustments, Borrowings	(257,000)	(276,000)
Accrued interest payable and other liabilities	7,851,000	7,973,000
Adjustments, accrued interest payable and other liabilities	(122,000)	(3,184,000)
Total Liabilities Assumed	1,012,200,000	1,012,579,000
Adjustments, Total Liabilities Assumed	(379,000)	(2,458,000)
Total Net Assets Acquired	105,953,000	107,756,000
Adjustments, Total Net Assets Acquired	(1,803,000)	(14,295,000)
Identifiable Intangible Assets			$ 6,900,000
Total Fair Value of Net Assets Acquired and Identified	115,013,000	116,816,000
Adjustments, Total Fair Value of Net Assets Acquired and Identified	(1,803,000)
Cash	360,000	360,000
Common stock		200,631,000
Fair Value of Total Consideration	200,991,000	200,991,000
Goodwill	85,978,000	84,175,000		86,000,000
Core Deposits | DNB
Fair Value of Assets Acquired
Core deposits and other intangible assets	7,288,000	7,288,000
Adjustments, Core deposits and other intangible assets	0
Fair Value of Liabilities Assumed
Identifiable Intangible Assets	7,288,000	7,288,000
Wealth management | DNB
Fair Value of Assets Acquired
Core deposits and other intangible assets	1,772,000	1,772,000		300,000
Adjustments, Core deposits and other intangible assets	0
Fair Value of Liabilities Assumed
Identifiable Intangible Assets	$ 1,772,000	$ 1,772,000		$ 300,000