Amount of increase in allowance for credit loss on financing receivable from acquisition.

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Amount of recovery of off-balance sheet credit exposure which had previously been fully or partially written-off. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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For an unclassified balance sheet, the amount of fees and other revenue, excluding investment income receivable, earned but not yet received, which were recognized in conformity with revenue recognition criteria based on estimates or specific contractual terms.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Allowance for credit losses - loans.
Beginning balance	$ 49,869
Provision	14,773	$ (8,839)	$ 14,212
Ending balance	61,059	49,869
Liabilities for off-balance-sheet credit exposures
Charge-offs	0	0
Recoveries	0	0
PCD Allowance at Acquisition	0
Provision	320
Beginning balance	803	1,489	0
Ending balance	1,123	803	1,489
Allowance for Credit Losses
Accrued interest and fees receivable	25,100	16,700
Allowance for loan losses	61,059	49,869
Elmira acquisition
Allowance for credit losses - loans.
Beginning balance	49,900
Ending balance	61,100	49,900
Allowance for Credit Losses
Allowance for loan losses	61,100	49,900
Topic ASC 326
Liabilities for off-balance-sheet credit exposures
Charge-offs			0
Recoveries			0
Steuben acquisition			67
Provision		(686)	237
Beginning balance		1,489	1,185
Ending balance			1,489
Topic ASC 326 \| Cumulative Effect Adjustment
Liabilities for off-balance-sheet credit exposures
Beginning balance			1,185
Acquired Impaired Loans
Allowance for credit losses - loans.
Beginning balance			163
Allowance for Credit Losses
Allowance for loan losses
Acquired Impaired Loans \| Topic ASC 326
Allowance for credit losses - loans.
Beginning balance		0	(163)
Charge-offs			0
Recoveries			0
Steuben acquisition			0
Provision			0
Ending balance			0
Allowance for Credit Losses
Allowance for loan losses			0
Acquired Impaired Loans \| Topic ASC 326 \| Cumulative Effect Adjustment
Allowance for credit losses - loans.
Beginning balance			0
Allowance for Credit Losses
Allowance for loan losses
Home Equity
Allowance for credit losses - loans.
Beginning balance			2,129
Allowance for Credit Losses
Allowance for loan losses
Home Equity \| Topic ASC 326
Allowance for credit losses - loans.
Beginning balance		2,222	808
Charge-offs			(199)
Recoveries			28
Steuben acquisition			235
Provision			(779)
Ending balance			2,222
Allowance for Credit Losses
Allowance for loan losses			2,222
Home Equity \| Topic ASC 326 \| Cumulative Effect Adjustment
Allowance for credit losses - loans.
Beginning balance			2,937
Allowance for Credit Losses
Allowance for loan losses
Commercial Portfolio Segment \| Business Lending
Allowance for credit losses - loans.
Beginning balance	22,995	30,072	19,426
Charge-offs		(1,922)
Recoveries		796
Ending balance		22,995	30,072
Allowance for Credit Losses
Allowance for loan losses		22,995	30,072
Commercial Portfolio Segment \| Business Lending \| Topic ASC 326
Allowance for credit losses - loans.
Beginning balance		30,072	3,360
Charge-offs			(1,588)
Recoveries			796
Steuben acquisition			3,011
Provision		(5,951)	5,067
Ending balance			30,072
Allowance for Credit Losses
Allowance for loan losses			30,072
Commercial Portfolio Segment \| Business Lending \| Topic ASC 326 \| Cumulative Effect Adjustment
Allowance for credit losses - loans.
Beginning balance			22,786
Allowance for Credit Losses
Allowance for loan losses
Commercial Portfolio Segment \| Consumer Mortgage
Allowance for credit losses - loans.
Beginning balance	10,017	10,672	10,269
Charge-offs		(426)
Recoveries		91
Ending balance		10,017	10,672
Allowance for Credit Losses
Allowance for loan losses		10,017	10,672
Commercial Portfolio Segment \| Consumer Mortgage \| Topic ASC 326
Allowance for credit losses - loans.
Beginning balance		10,672	(1,051)
Charge-offs			(862)
Recoveries			130
Steuben acquisition			146
Provision		(320)	2,040
Ending balance			10,672
Allowance for Credit Losses
Allowance for loan losses			10,672
Commercial Portfolio Segment \| Consumer Mortgage \| Topic ASC 326 \| Cumulative Effect Adjustment
Allowance for credit losses - loans.
Beginning balance			9,218
Allowance for Credit Losses
Allowance for loan losses
Consumer Portfolio Segment \| Business Lending
Allowance for credit losses - loans.
Beginning balance	22,995
Charge-offs	(824)
Recoveries	1,374
PCD Allowance at Acquisition	71
Provision	(319)
Ending balance	23,297	22,995
Allowance for Credit Losses
Allowance for loan losses	23,297	22,995
Consumer Portfolio Segment \| Consumer Mortgage
Allowance for credit losses - loans.
Beginning balance	10,017
Charge-offs	(313)
Recoveries	62
PCD Allowance at Acquisition	0
Provision	4,577
Ending balance	14,343	10,017
Allowance for Credit Losses
Allowance for loan losses	14,343	10,017
Consumer Portfolio Segment \| Consumer Indirect
Allowance for credit losses - loans.
Beginning balance	11,737	13,696	13,712
Charge-offs	(7,986)	(5,160)
Recoveries	4,756	4,346
PCD Allowance at Acquisition	0
Provision	9,345
Ending balance	17,852	11,737	13,696
Allowance for Credit Losses
Allowance for loan losses	17,852	11,737	13,696
Consumer Portfolio Segment \| Consumer Indirect \| Topic ASC 326
Allowance for credit losses - loans.
Beginning balance		13,696	(997)
Charge-offs			(6,382)
Recoveries			3,992
Steuben acquisition			183
Provision		(1,145)	3,188
Ending balance			13,696
Allowance for Credit Losses
Allowance for loan losses			13,696
Consumer Portfolio Segment \| Consumer Indirect \| Topic ASC 326 \| Cumulative Effect Adjustment
Allowance for credit losses - loans.
Beginning balance			12,715
Allowance for Credit Losses
Allowance for loan losses
Consumer Portfolio Segment \| Consumer Direct
Allowance for credit losses - loans.
Beginning balance	2,306	3,207	3,255
Charge-offs	(1,252)	(1,232)
Recoveries	772	793
PCD Allowance at Acquisition	0
Provision	1,147
Ending balance	2,973	2,306	3,207
Allowance for Credit Losses
Allowance for loan losses	2,973	2,306	3,207
Consumer Portfolio Segment \| Consumer Direct \| Topic ASC 326
Allowance for credit losses - loans.
Beginning balance		3,207	(643)
Charge-offs			(1,633)
Recoveries			743
Steuben acquisition			87
Provision		(462)	1,398
Ending balance			3,207
Allowance for Credit Losses
Allowance for loan losses			3,207
Consumer Portfolio Segment \| Consumer Direct \| Topic ASC 326 \| Cumulative Effect Adjustment
Allowance for credit losses - loans.
Beginning balance			2,612
Allowance for Credit Losses
Allowance for loan losses
Consumer Portfolio Segment \| Home Equity
Allowance for credit losses - loans.
Beginning balance	1,814	2,222
Charge-offs	(86)	(225)
Recoveries	163	92
PCD Allowance at Acquisition	0
Provision	(297)
Ending balance	1,594	1,814	2,222
Allowance for Credit Losses
Allowance for loan losses	1,594	1,814	2,222
Consumer Portfolio Segment \| Home Equity \| Topic ASC 326
Allowance for credit losses - loans.
Provision		(275)
Unallocated Financing Receivables
Allowance for credit losses - loans.
Beginning balance	1,000	1,000	957
Charge-offs	0	0
Recoveries	0	0
PCD Allowance at Acquisition	0
Provision	0
Ending balance	1,000	1,000	1,000
Allowance for Credit Losses
Allowance for loan losses	1,000	1,000	1,000
Unallocated Financing Receivables \| Topic ASC 326
Allowance for credit losses - loans.
Beginning balance		1,000	43
Charge-offs			0
Recoveries			0
Steuben acquisition			0
Provision		0	0
Ending balance			1,000
Allowance for Credit Losses
Allowance for loan losses			1,000
Unallocated Financing Receivables \| Topic ASC 326 \| Cumulative Effect Adjustment
Allowance for credit losses - loans.
Beginning balance			1,000
Allowance for Credit Losses
Allowance for loan losses
Allowances for credit losses
Allowance for credit losses - loans.
Beginning balance	49,869	60,869	49,911
Charge-offs	(10,461)	(8,965)
Recoveries	7,127	6,118
PCD Allowance at Acquisition	71
Provision	14,453
Ending balance	61,059	49,869	60,869
Allowance for Credit Losses
Allowance for loan losses	61,059	49,869	60,869
Allowances for credit losses \| Topic ASC 326
Allowance for credit losses - loans.
Beginning balance		60,869	1,357
Charge-offs			(10,664)
Recoveries			5,689
Steuben acquisition			3,662
Provision		(8,153)	10,914
Ending balance			60,869
Allowance for Credit Losses
Allowance for loan losses			60,869
Allowances for credit losses \| Topic ASC 326 \| Cumulative Effect Adjustment
Allowance for credit losses - loans.
Beginning balance			51,268
Allowance for Credit Losses
Allowance for loan losses
Total allowances for credit losses
Allowance for credit losses - loans.
Beginning balance	50,672	62,358	49,911
Charge-offs	(10,461)	(8,965)
Recoveries	7,127	6,118
PCD Allowance at Acquisition	71
Provision	14,773
Ending balance	62,182	50,672	62,358
Allowance for Credit Losses
Allowance for loan losses	$ 62,182	50,672	62,358
Total allowances for credit losses \| Topic ASC 326
Allowance for credit losses - loans.
Beginning balance		62,358	2,542
Charge-offs			(10,664)
Recoveries			5,689
Steuben acquisition			3,729
Provision		$ (8,839)	11,151
Ending balance			62,358
Allowance for Credit Losses
Allowance for loan losses			62,358
Total allowances for credit losses \| Topic ASC 326 \| Cumulative Effect Adjustment
Allowance for credit losses - loans.
Beginning balance			$ 52,453
Allowance for Credit Losses
Allowance for loan losses