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Loans and Leases and the Allowance for Credit Losses - Schedule of Amortized Cost Basis of Loans and Leases by Credit Quality Indicator, Loan Class, and Year of Origination (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 1,348,587		$ 1,348,587		$ 1,545,211
Fiscal year before latest fiscal year	1,362,139		1,362,139		1,699,053
Two years before latest fiscal year	1,524,802		1,524,802		2,517,363
Three years before latest fiscal year	2,184,445		2,184,445		2,093,226
Four years before latest fiscal year	1,944,097		1,944,097		1,535,932
Prior	3,142,710		3,142,710		2,022,046
Revolving Loans	2,441,093		2,441,093		2,606,317
Revolving Loans Converted to Term Loans	73,706		73,706		56,832
Total Loans and Leases	14,021,579		14,021,579		14,075,980
Gross charge-offs, current year			1,096		2,020
Gross charge-offs, fiscal year before current year			2,741		4,011
Gross charge-offs, two fiscal years before current year			2,764		4,241
Gross charge-offs, three fiscal years before current year			2,776		4,727
Gross charge-offs, four fiscal years before current year			1,309		747
Gross charge-offs, five fiscal years before current year			2,735		2,689
Gross charge-offs, Revolving			157		429
Gross charge-offs, Revolving loans converted to term loans			101		272
Total Loans and Leases	3,959	$ 5,336	13,679	$ 13,921	19,136
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	736,386		736,386		933,502
Fiscal year before latest fiscal year	842,375		842,375		1,165,444
Two years before latest fiscal year	1,083,782		1,083,782		1,457,532
Three years before latest fiscal year	1,252,728		1,252,728		765,680
Four years before latest fiscal year	716,840		716,840		576,097
Prior	1,078,261		1,078,261		730,012
Revolving Loans	384,543		384,543		496,859
Revolving Loans Converted to Term Loans	185		185		283
Total Loans and Leases	6,095,100		6,095,100		6,125,409
Gross charge-offs, current year			315		362
Gross charge-offs, fiscal year before current year			139		282
Gross charge-offs, two fiscal years before current year			0		0
Gross charge-offs, three fiscal years before current year			0		1,438
Gross charge-offs, four fiscal years before current year			0		128
Gross charge-offs, five fiscal years before current year			1,322		399
Gross charge-offs, Revolving			0		0
Gross charge-offs, Revolving loans converted to term loans			0		0
Total Loans and Leases	171	1,021	1,776	2,256	2,609
Commercial | Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	525,096		525,096		437,185
Fiscal year before latest fiscal year	342,461		342,461		749,844
Two years before latest fiscal year	676,014		676,014		1,117,965
Three years before latest fiscal year	966,511		966,511		602,870
Four years before latest fiscal year	570,493		570,493		427,764
Prior	924,585		924,585		636,339
Revolving Loans	35,551		35,551		48,655
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	4,040,711		4,040,711		4,020,622
Gross charge-offs, current year			0		0
Gross charge-offs, fiscal year before current year			0		0
Gross charge-offs, two fiscal years before current year			0		0
Gross charge-offs, three fiscal years before current year			0		0
Gross charge-offs, four fiscal years before current year			0		0
Gross charge-offs, five fiscal years before current year			0		0
Gross charge-offs, Revolving			0		0
Gross charge-offs, Revolving loans converted to term loans			0		0
Total Loans and Leases			0		0
Commercial | Commercial Mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	489,190		489,190		401,415
Fiscal year before latest fiscal year	305,933		305,933		687,580
Two years before latest fiscal year	662,439		662,439		1,091,627
Three years before latest fiscal year	881,134		881,134		596,386
Four years before latest fiscal year	567,451		567,451		405,244
Prior	893,704		893,704		600,386
Revolving Loans	35,551		35,551		48,655
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	3,835,402		3,835,402		3,831,293
Commercial | Commercial Mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	32,500		32,500		0
Fiscal year before latest fiscal year	0		0		47,773
Two years before latest fiscal year	0		0		1,918
Three years before latest fiscal year	0		0		3,348
Four years before latest fiscal year	0		0		2,911
Prior	0		0		15,148
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	32,500		32,500		71,098
Commercial | Commercial Mortgage | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	3,406		3,406		35,770
Fiscal year before latest fiscal year	36,528		36,528		14,491
Two years before latest fiscal year	13,575		13,575		24,420
Three years before latest fiscal year	85,377		85,377		3,136
Four years before latest fiscal year	3,042		3,042		19,609
Prior	30,881		30,881		20,805
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	172,809		172,809		118,231
Commercial | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	170,151		170,151		357,623
Fiscal year before latest fiscal year	315,251		315,251		296,782
Two years before latest fiscal year	261,438		261,438		240,285
Three years before latest fiscal year	212,027		212,027		151,289
Four years before latest fiscal year	136,638		136,638		141,748
Prior	144,272		144,272		85,685
Revolving Loans	341,270		341,270		431,438
Revolving Loans Converted to Term Loans	185		185		283
Total Loans and Leases	1,581,232		1,581,232		1,705,133
Gross charge-offs, current year			315		362
Gross charge-offs, fiscal year before current year			139		282
Gross charge-offs, two fiscal years before current year			0		0
Gross charge-offs, three fiscal years before current year			0		1,438
Gross charge-offs, four fiscal years before current year			0		128
Gross charge-offs, five fiscal years before current year			1,322		399
Gross charge-offs, Revolving			0		0
Gross charge-offs, Revolving loans converted to term loans			0		0
Total Loans and Leases			1,776		2,609
Commercial | Commercial and Industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	169,766		169,766		356,831
Fiscal year before latest fiscal year	314,312		314,312		281,168
Two years before latest fiscal year	246,977		246,977		236,802
Three years before latest fiscal year	209,943		209,943		146,458
Four years before latest fiscal year	134,594		134,594		135,158
Prior	141,025		141,025		79,258
Revolving Loans	307,852		307,852		375,135
Revolving Loans Converted to Term Loans	185		185		276
Total Loans and Leases	1,524,654		1,524,654		1,611,086
Commercial | Commercial and Industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		467
Fiscal year before latest fiscal year	386		386		0
Two years before latest fiscal year	0		0		0
Three years before latest fiscal year	0		0		0
Four years before latest fiscal year	0		0		0
Prior	0		0		0
Revolving Loans	23,898		23,898		38,587
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	24,284		24,284		39,054
Commercial | Commercial and Industrial | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	385		385		325
Fiscal year before latest fiscal year	553		553		15,614
Two years before latest fiscal year	14,461		14,461		3,483
Three years before latest fiscal year	2,084		2,084		4,831
Four years before latest fiscal year	2,044		2,044		6,590
Prior	3,247		3,247		6,427
Revolving Loans	9,520		9,520		17,716
Revolving Loans Converted to Term Loans	0		0		7
Total Loans and Leases	32,294		32,294		54,993
Commercial | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	25,868		25,868		89,334
Fiscal year before latest fiscal year	137,884		137,884		110,153
Two years before latest fiscal year	139,098		139,098		89,677
Three years before latest fiscal year	67,206		67,206		1,689
Four years before latest fiscal year	3,166		3,166		1,279
Prior	0		0		0
Revolving Loans	7,722		7,722		16,766
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	380,944		380,944		308,898
Gross charge-offs, current year			0		0
Gross charge-offs, fiscal year before current year			0		0
Gross charge-offs, two fiscal years before current year			0		0
Gross charge-offs, three fiscal years before current year			0		0
Gross charge-offs, four fiscal years before current year			0		0
Gross charge-offs, five fiscal years before current year			0		0
Gross charge-offs, Revolving			0		0
Gross charge-offs, Revolving loans converted to term loans			0		0
Total Loans and Leases			0		0
Commercial | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	25,868		25,868		89,334
Fiscal year before latest fiscal year	137,884		137,884		110,153
Two years before latest fiscal year	139,098		139,098		87,006
Three years before latest fiscal year	49,742		49,742		1,689
Four years before latest fiscal year	3,166		3,166		1,279
Prior	0		0		0
Revolving Loans	7,722		7,722		16,766
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	363,480		363,480		306,227
Commercial | Construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before latest fiscal year	0		0		0
Two years before latest fiscal year	0		0		2,671
Three years before latest fiscal year	14,614		14,614		0
Four years before latest fiscal year	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	14,614		14,614		2,671
Commercial | Construction | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0
Fiscal year before latest fiscal year	0		0
Two years before latest fiscal year	0		0
Three years before latest fiscal year	2,850		2,850
Four years before latest fiscal year	0		0
Prior	0		0
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total Loans and Leases	2,850		2,850
Commercial | Lease Financing
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	15,271		15,271		49,360
Fiscal year before latest fiscal year	46,779		46,779		8,665
Two years before latest fiscal year	7,232		7,232		9,605
Three years before latest fiscal year	6,984		6,984		9,832
Four years before latest fiscal year	6,543		6,543		5,306
Prior	9,404		9,404		7,988
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	92,213		92,213		90,756
Gross charge-offs, current year			0		0
Gross charge-offs, fiscal year before current year			0		0
Gross charge-offs, two fiscal years before current year			0		0
Gross charge-offs, three fiscal years before current year			0		0
Gross charge-offs, four fiscal years before current year			0		0
Gross charge-offs, five fiscal years before current year			0		0
Gross charge-offs, Revolving			0		0
Gross charge-offs, Revolving loans converted to term loans			0		0
Total Loans and Leases			0		0
Commercial | Lease Financing | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	15,271		15,271		49,360
Fiscal year before latest fiscal year	46,779		46,779		8,174
Two years before latest fiscal year	6,830		6,830		9,568
Three years before latest fiscal year	6,958		6,958		9,751
Four years before latest fiscal year	6,486		6,486		5,244
Prior	9,365		9,365		7,602
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	91,689		91,689		89,699
Commercial | Lease Financing | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before latest fiscal year	0		0		491
Two years before latest fiscal year	402		402		37
Three years before latest fiscal year	26		26		81
Four years before latest fiscal year	57		57		62
Prior	39		39		386
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	524		524		1,057
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	612,201		612,201		611,709
Fiscal year before latest fiscal year	519,764		519,764		533,609
Two years before latest fiscal year	441,020		441,020		1,059,831
Three years before latest fiscal year	931,717		931,717		1,327,546
Four years before latest fiscal year	1,227,257		1,227,257		959,835
Prior	2,064,449		2,064,449		1,292,034
Revolving Loans	2,056,550		2,056,550		2,109,458
Revolving Loans Converted to Term Loans	73,521		73,521		56,549
Total Loans and Leases	7,926,479		7,926,479		7,950,571
Gross charge-offs, current year			781		1,658
Gross charge-offs, fiscal year before current year			2,602		3,729
Gross charge-offs, two fiscal years before current year			2,764		4,241
Gross charge-offs, three fiscal years before current year			2,776		3,289
Gross charge-offs, four fiscal years before current year			1,309		619
Gross charge-offs, five fiscal years before current year			1,413		2,290
Gross charge-offs, Revolving			157		429
Gross charge-offs, Revolving loans converted to term loans			101		272
Total Loans and Leases	3,788	$ 4,315	11,903	$ 11,665	16,527
Consumer | Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	339,885		339,885		268,330
Fiscal year before latest fiscal year	242,793		242,793		271,985
Two years before latest fiscal year	244,336		244,336		752,778
Three years before latest fiscal year	717,460		717,460		1,180,665
Four years before latest fiscal year	1,135,044		1,135,044		920,015
Prior	2,005,696		2,005,696		1,234,510
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	4,685,214		4,685,214		4,628,283
Gross charge-offs, current year			0		0
Gross charge-offs, fiscal year before current year			0		0
Gross charge-offs, two fiscal years before current year			0		0
Gross charge-offs, three fiscal years before current year			0		337
Gross charge-offs, four fiscal years before current year			0		0
Gross charge-offs, five fiscal years before current year			0		48
Gross charge-offs, Revolving			0		0
Gross charge-offs, Revolving loans converted to term loans			0		0
Total Loans and Leases			0		385
Consumer | Residential Mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	339,885		339,885		268,330
Fiscal year before latest fiscal year	242,793		242,793		271,985
Two years before latest fiscal year	244,336		244,336		751,920
Three years before latest fiscal year	715,635		715,635		1,180,191
Four years before latest fiscal year	1,135,044		1,135,044		919,280
Prior	2,004,188		2,004,188		1,232,582
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	4,681,881		4,681,881		4,624,288
Consumer | Residential Mortgage | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before latest fiscal year	0		0		0
Two years before latest fiscal year	0		0		858
Three years before latest fiscal year	1,825		1,825		474
Four years before latest fiscal year	0		0		735
Prior	1,508		1,508		1,928
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	3,333		3,333		3,995
Consumer | Home Equity
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before latest fiscal year	0		0		0
Two years before latest fiscal year	0		0		0
Three years before latest fiscal year	0		0		0
Four years before latest fiscal year	0		0		0
Prior	38		38		40
Revolving Loans	2,056,040		2,056,040		2,108,925
Revolving Loans Converted to Term Loans	73,521		73,521		56,549
Total Loans and Leases	2,129,599		2,129,599		2,165,514
Gross charge-offs, current year			0		0
Gross charge-offs, fiscal year before current year			0		0
Gross charge-offs, two fiscal years before current year			0		0
Gross charge-offs, three fiscal years before current year			0		0
Gross charge-offs, four fiscal years before current year			0		0
Gross charge-offs, five fiscal years before current year			0		0
Gross charge-offs, Revolving			157		429
Gross charge-offs, Revolving loans converted to term loans			101		272
Total Loans and Leases			258		701
Consumer | Home Equity | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before latest fiscal year	0		0		0
Two years before latest fiscal year	0		0		0
Three years before latest fiscal year	0		0		0
Four years before latest fiscal year	0		0		0
Prior	38		38		40
Revolving Loans	2,052,721		2,052,721		2,105,833
Revolving Loans Converted to Term Loans	73,142		73,142		55,963
Total Loans and Leases	2,125,901		2,125,901		2,161,836
Consumer | Home Equity | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before latest fiscal year	0		0		0
Two years before latest fiscal year	0		0		0
Three years before latest fiscal year	0		0		0
Four years before latest fiscal year	0		0		0
Prior	0		0		0
Revolving Loans	3,319		3,319		3,092
Revolving Loans Converted to Term Loans	379		379		586
Total Loans and Leases	3,698		3,698		3,678
Consumer | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	149,041		149,041		210,235
Fiscal year before latest fiscal year	169,498		169,498		187,327
Two years before latest fiscal year	141,219		141,219		210,431
Three years before latest fiscal year	150,221		150,221		94,646
Four years before latest fiscal year	59,836		59,836		34,671
Prior	29,429		29,429		26,836
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	699,244		699,244		764,146
Gross charge-offs, current year			64		227
Gross charge-offs, fiscal year before current year			1,030		1,578
Gross charge-offs, two fiscal years before current year			1,303		1,340
Gross charge-offs, three fiscal years before current year			980		1,083
Gross charge-offs, four fiscal years before current year			314		293
Gross charge-offs, five fiscal years before current year			681		821
Gross charge-offs, Revolving			0		0
Gross charge-offs, Revolving loans converted to term loans			0		0
Total Loans and Leases			4,372		5,342
Consumer | Automobile | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	149,021		149,021		210,145
Fiscal year before latest fiscal year	169,276		169,276		187,136
Two years before latest fiscal year	141,130		141,130		210,207
Three years before latest fiscal year	150,162		150,162		94,492
Four years before latest fiscal year	59,792		59,792		34,614
Prior	29,319		29,319		26,777
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	698,700		698,700		763,371
Consumer | Automobile | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	20		20		90
Fiscal year before latest fiscal year	222		222		191
Two years before latest fiscal year	89		89		224
Three years before latest fiscal year	59		59		154
Four years before latest fiscal year	44		44		57
Prior	110		110		59
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	544		544		775
Consumer | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	123,275		123,275		133,144
Fiscal year before latest fiscal year	107,473		107,473		74,297
Two years before latest fiscal year	55,465		55,465		96,622
Three years before latest fiscal year	64,036		64,036		52,235
Four years before latest fiscal year	32,377		32,377		5,149
Prior	29,286		29,286		30,648
Revolving Loans	510		510		533
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	412,422		412,422		392,628
Gross charge-offs, current year			717		1,431
Gross charge-offs, fiscal year before current year			1,572		2,151
Gross charge-offs, two fiscal years before current year			1,461		2,901
Gross charge-offs, three fiscal years before current year			1,796		1,869
Gross charge-offs, four fiscal years before current year			995		326
Gross charge-offs, five fiscal years before current year			732		1,421
Gross charge-offs, Revolving					0
Gross charge-offs, Revolving loans converted to term loans					0
Total Loans and Leases			7,273		10,099
Consumer | Other | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	123,246		123,246		133,093
Fiscal year before latest fiscal year	107,285		107,285		74,068
Two years before latest fiscal year	55,314		55,314		96,376
Three years before latest fiscal year	63,902		63,902		52,152
Four years before latest fiscal year	32,353		32,353		5,149
Prior	29,215		29,215		30,580
Revolving Loans	510		510		533
Revolving Loans Converted to Term Loans	0		0		0
Total Loans and Leases	411,825		411,825		391,951
Consumer | Other | Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	29		29		51
Fiscal year before latest fiscal year	188		188		229
Two years before latest fiscal year	151		151		246
Three years before latest fiscal year	134		134		83
Four years before latest fiscal year	24		24		0
Prior	71		71		68
Revolving Loans	0		0		0
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