Loans and Leases and Allowance for Credit Losses - Amortized Cost of Loans by Risk Category by Vintage Year (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans excluding fair value hedge basis adjustment	$ 18,375,246		$ 18,316,862
Current period gross charge-offs, Total	15,409	$ 9,524
Commercial | Owner occupied CRE
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	123,244		657,289
Originated in prior year	653,388		698,640
Originated two years prior	689,133		638,046
Originated three years prior	623,752		564,966
Originated four years prior	559,995		216,684
Originated five or more years prior	526,186		348,080
Revolvers	114,496		118,733
Revolvers converted to term loans	20,037		21,613
Total loans excluding fair value hedge basis adjustment	3,310,231		3,264,051
Current period gross charge-offs, in current fiscal year	0		207
Current period gross charge-offs, in prior year	192		48
Current period gross charge-offs, two years prior	17		0
Current period gross charge-offs, three years prior	0		819
Current period gross charge-offs, four years prior	0		0
Current period gross charge-offs, five or more years prior	219		0
Revolvers	0		0
Revolvers converted to term loans	0		0
Current period gross charge-offs, Total	428		1,074
Commercial | Owner occupied CRE | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	121,015		643,752
Originated in prior year	643,801		681,834
Originated two years prior	665,648		615,571
Originated three years prior	594,768		553,047
Originated four years prior	546,727		202,068
Originated five or more years prior	501,390		337,495
Revolvers	113,065		117,212
Revolvers converted to term loans	17,263		18,671
Total loans excluding fair value hedge basis adjustment	3,203,677		3,169,650
Commercial | Owner occupied CRE | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	831		2,409
Originated in prior year	1,837		7,877
Originated two years prior	14,475		7,070
Originated three years prior	13,905		4,815
Originated four years prior	9,131		9,221
Originated five or more years prior	11,771		2,245
Revolvers	0		100
Revolvers converted to term loans	2,774		254
Total loans excluding fair value hedge basis adjustment	54,724		33,991
Commercial | Owner occupied CRE | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	1,398		11,128
Originated in prior year	7,750		8,929
Originated two years prior	9,010		15,405
Originated three years prior	15,079		7,104
Originated four years prior	4,137		5,395
Originated five or more years prior	13,025		8,340
Revolvers	1,431		1,421
Revolvers converted to term loans	0		2,688
Total loans excluding fair value hedge basis adjustment	51,830		60,410
Commercial | Income producing CRE
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	223,732		777,483
Originated in prior year	670,390		968,308
Originated two years prior	965,451		873,041
Originated three years prior	858,815		797,416
Originated four years prior	715,985		338,109
Originated five or more years prior	708,029		445,635
Revolvers	51,780		50,659
Revolvers converted to term loans	12,140		13,301
Total loans excluding fair value hedge basis adjustment	4,206,322		4,263,952
Current period gross charge-offs, in current fiscal year	0		3,033
Current period gross charge-offs, in prior year	0		2,534
Current period gross charge-offs, two years prior	0		0
Current period gross charge-offs, three years prior	0		0
Current period gross charge-offs, four years prior	0		0
Current period gross charge-offs, five or more years prior	229		2,291
Revolvers	0		0
Revolvers converted to term loans	0		0
Current period gross charge-offs, Total	229		7,858
Commercial | Income producing CRE | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	157,636		661,093
Originated in prior year	570,861		931,559
Originated two years prior	929,507		851,529
Originated three years prior	835,019		750,415
Originated four years prior	681,583		302,845
Originated five or more years prior	668,180		419,111
Revolvers	51,731		50,659
Revolvers converted to term loans	12,087		13,247
Total loans excluding fair value hedge basis adjustment	3,906,604		3,980,458
Commercial | Income producing CRE | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	27,581		48,358
Originated in prior year	51,055		26,751
Originated two years prior	26,868		18,989
Originated three years prior	21,336		25,964
Originated four years prior	28,963		6,387
Originated five or more years prior	12,362		6,173
Revolvers	49		0
Revolvers converted to term loans	0		0
Total loans excluding fair value hedge basis adjustment	168,214		132,622
Commercial | Income producing CRE | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	38,515		68,032
Originated in prior year	48,474		9,998
Originated two years prior	9,076		2,523
Originated three years prior	2,460		21,037
Originated four years prior	5,439		28,877
Originated five or more years prior	27,487		20,351
Revolvers	0		0
Revolvers converted to term loans	53		54
Total loans excluding fair value hedge basis adjustment	131,504		150,872
Commercial | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	108,975		627,653
Originated in prior year	587,532		433,407
Originated two years prior	405,746		322,277
Originated three years prior	298,107		144,573
Originated four years prior	135,945		92,682
Originated five or more years prior	210,151		132,518
Revolvers	645,246		643,014
Revolvers converted to term loans	12,803		14,921
Total loans excluding fair value hedge basis adjustment	2,404,505		2,411,045
Current period gross charge-offs, in current fiscal year	0		5,999
Current period gross charge-offs, in prior year	3,105		1,627
Current period gross charge-offs, two years prior	409		13,153
Current period gross charge-offs, three years prior	107		2,377
Current period gross charge-offs, four years prior	111		400
Current period gross charge-offs, five or more years prior	532		157
Revolvers	0		0
Revolvers converted to term loans	522		1,825
Current period gross charge-offs, Total	4,786		25,538
Commercial | Commercial & industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	97,538		610,288
Originated in prior year	559,393		425,626
Originated two years prior	398,107		299,170
Originated three years prior	275,540		130,586
Originated four years prior	122,578		82,710
Originated five or more years prior	197,346		130,190
Revolvers	578,784		581,871
Revolvers converted to term loans	11,182		13,332
Total loans excluding fair value hedge basis adjustment	2,240,468		2,273,773
Commercial | Commercial & industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	10,752		6,459
Originated in prior year	2,434		2,068
Originated two years prior	3,821		472
Originated three years prior	6,862		5,430
Originated four years prior	8,432		5,473
Originated five or more years prior	8,090		718
Revolvers	34,656		14,861
Revolvers converted to term loans	313		274
Total loans excluding fair value hedge basis adjustment	75,360		35,755
Commercial | Commercial & industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	685		10,906
Originated in prior year	25,705		5,713
Originated two years prior	3,818		22,635
Originated three years prior	15,705		8,557
Originated four years prior	4,935		4,499
Originated five or more years prior	4,715		1,610
Revolvers	31,806		46,282
Revolvers converted to term loans	1,308		1,315
Total loans excluding fair value hedge basis adjustment	88,677		101,517
Commercial | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	167,154		682,073
Originated in prior year	633,287		640,669
Originated two years prior	668,729		293,313
Originated three years prior	263,125		95,769
Originated four years prior	63,228		59,598
Originated five or more years prior	74,525		24,780
Revolvers	65,090		62,370
Revolvers converted to term loans	936		966
Total loans excluding fair value hedge basis adjustment	1,936,074		1,859,538
Current period gross charge-offs, in current fiscal year	0		0
Current period gross charge-offs, in prior year	0		60
Current period gross charge-offs, two years prior	53		0
Current period gross charge-offs, three years prior	0		0
Current period gross charge-offs, four years prior	0		0
Current period gross charge-offs, five or more years prior	0		0
Revolvers	0		0
Revolvers converted to term loans	0		0
Current period gross charge-offs, Total	53		60
Commercial | Commercial construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	160,727		665,792
Originated in prior year	627,053		638,761
Originated two years prior	667,547		293,276
Originated three years prior	263,091		95,046
Originated four years prior	62,508		59,471
Originated five or more years prior	74,320		24,698
Revolvers	65,090		62,370
Revolvers converted to term loans	936		966
Total loans excluding fair value hedge basis adjustment	1,921,272		1,840,380
Commercial | Commercial construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	4,849		28
Originated in prior year	204		124
Originated two years prior	118		6
Originated three years prior	4		0
Originated four years prior	0		0
Originated five or more years prior	0		0
Revolvers	0		0
Revolvers converted to term loans	0		0
Total loans excluding fair value hedge basis adjustment	5,175		158
Commercial | Commercial construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	1,578		16,253
Originated in prior year	6,030		1,784
Originated two years prior	1,064		31
Originated three years prior	30		723
Originated four years prior	720		127
Originated five or more years prior	205		82
Revolvers	0		0
Revolvers converted to term loans	0		0
Total loans excluding fair value hedge basis adjustment	9,627		19,000
Commercial | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	192,828		674,672
Originated in prior year	580,832		500,477
Originated two years prior	457,478		235,909
Originated three years prior	206,510		84,467
Originated four years prior	70,491		41,870
Originated five or more years prior	35,766		3,725
Revolvers	0		0
Revolvers converted to term loans	0		0
Total loans excluding fair value hedge basis adjustment	1,543,905		1,541,120
Current period gross charge-offs, in current fiscal year	0		474
Current period gross charge-offs, in prior year	1,219		10,902
Current period gross charge-offs, two years prior	3,457		9,764
Current period gross charge-offs, three years prior	2,199		1,960
Current period gross charge-offs, four years prior	383		786
Current period gross charge-offs, five or more years prior	31		320
Revolvers	0		0
Revolvers converted to term loans	0		0
Current period gross charge-offs, Total	7,289		24,206
Commercial | Equipment financing | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	192,828		673,201
Originated in prior year	578,878		496,336
Originated two years prior	452,224		233,422
Originated three years prior	201,010		83,507
Originated four years prior	68,999		41,053
Originated five or more years prior	34,265		3,722
Revolvers	0		0
Revolvers converted to term loans	0		0
Total loans excluding fair value hedge basis adjustment	1,528,204		1,531,241
Commercial | Equipment financing | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0
Originated in prior year	0
Originated two years prior	815
Originated three years prior	2,311
Originated four years prior	900
Originated five or more years prior	674
Revolvers	0
Revolvers converted to term loans	0
Total loans excluding fair value hedge basis adjustment	4,700
Commercial | Equipment financing | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0		1,471
Originated in prior year	1,954		4,141
Originated two years prior	4,439		2,487
Originated three years prior	3,189		960
Originated four years prior	592		817
Originated five or more years prior	827		3
Revolvers	0		0
Revolvers converted to term loans	0		0
Total loans excluding fair value hedge basis adjustment	11,001		9,879
Residential | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	15,324		209,676
Originated in prior year	177,055		70,042
Originated two years prior	44,554		9,827
Originated three years prior	9,044		5,207
Originated four years prior	4,948		1,084
Originated five or more years prior	6,262		5,721
Revolvers	0		0
Revolvers converted to term loans	92		93
Total loans excluding fair value hedge basis adjustment	257,279		301,650
Current period gross charge-offs, in current fiscal year	0		0
Current period gross charge-offs, in prior year	85		1,111
Current period gross charge-offs, two years prior	0		0
Current period gross charge-offs, three years prior	48		0
Current period gross charge-offs, four years prior	0		0
Current period gross charge-offs, five or more years prior	0		0
Revolvers	0		0
Revolvers converted to term loans	0		0
Current period gross charge-offs, Total	133		1,111
Residential | Commercial construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	15,109		208,798
Originated in prior year	176,092		70,011
Originated two years prior	44,524		9,827
Originated three years prior	9,044		5,201
Originated four years prior	4,941		1,046
Originated five or more years prior	6,127		5,614
Revolvers	0		0
Revolvers converted to term loans	92		93
Total loans excluding fair value hedge basis adjustment	255,929		300,590
Residential | Commercial construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	215		878
Originated in prior year	963		31
Originated two years prior	30		0
Originated three years prior	0		6
Originated four years prior	7		38
Originated five or more years prior	135		107
Revolvers	0		0
Revolvers converted to term loans	0		0
Total loans excluding fair value hedge basis adjustment	1,350		1,060
Residential | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	103,912		841,826
Originated in prior year	825,945		958,670
Originated two years prior	945,024		736,793
Originated three years prior	723,803		319,960
Originated four years prior	313,790		86,067
Originated five or more years prior	323,664		251,943
Revolvers	6		6
Revolvers converted to term loans	3,543		3,663
Total loans excluding fair value hedge basis adjustment	3,239,687		3,198,928
Current period gross charge-offs, in current fiscal year	0		0
Current period gross charge-offs, in prior year	0		51
Current period gross charge-offs, two years prior	13		0
Current period gross charge-offs, three years prior	0		0
Current period gross charge-offs, four years prior	0		0
Current period gross charge-offs, five or more years prior	3		38
Revolvers	0		0
Revolvers converted to term loans	0		0
Current period gross charge-offs, Total	16		89
Residential | Residential mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	102,601		839,825
Originated in prior year	823,173		955,592
Originated two years prior	941,593		734,078
Originated three years prior	721,699		318,886
Originated four years prior	311,808		84,736
Originated five or more years prior	315,388		245,648
Revolvers	6		6
Revolvers converted to term loans	3,262		3,415
Total loans excluding fair value hedge basis adjustment	3,219,530		3,182,186
Residential | Residential mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	1,311		2,001
Originated in prior year	2,772		3,078
Originated two years prior	3,431		2,715
Originated three years prior	2,104		1,074
Originated four years prior	1,982		1,331
Originated five or more years prior	8,276		6,295
Revolvers	0		0
Revolvers converted to term loans	281		248
Total loans excluding fair value hedge basis adjustment	20,157		16,742
Residential | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0		0
Originated in prior year	0		0
Originated two years prior	0		0
Originated three years prior	0		0
Originated four years prior	0		0
Originated five or more years prior	0		0
Revolvers	935,162		926,596
Revolvers converted to term loans	33,858		32,391
Total loans excluding fair value hedge basis adjustment	969,020		958,987
Current period gross charge-offs, in current fiscal year	0		0
Current period gross charge-offs, in prior year	0		0
Current period gross charge-offs, two years prior	0		0
Current period gross charge-offs, three years prior	0		0
Current period gross charge-offs, four years prior	0		0
Current period gross charge-offs, five or more years prior	0		0
Revolvers	0		0
Revolvers converted to term loans	7		167
Current period gross charge-offs, Total	7		167
Residential | Home equity | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0		0
Originated in prior year	0		0
Originated two years prior	0		0
Originated three years prior	0		0
Originated four years prior	0		0
Originated five or more years prior	0		0
Revolvers	935,162		926,596
Revolvers converted to term loans	28,461		28,412
Total loans excluding fair value hedge basis adjustment	963,623		955,008
Residential | Home equity | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0		0
Originated in prior year	0		0
Originated two years prior	0		0
Originated three years prior	0		0
Originated four years prior	0		0
Originated five or more years prior	0		0
Revolvers	0		0
Revolvers converted to term loans	5,397		3,979
Total loans excluding fair value hedge basis adjustment	5,397		3,979
Residential | Manufactured housing
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	128		46,143
Originated in prior year	45,209		74,089
Originated two years prior	72,210		52,415
Originated three years prior	51,290		46,755
Originated four years prior	45,846		32,612
Originated five or more years prior	113,438		84,460
Revolvers	0		0
Revolvers converted to term loans	0		0
Total loans excluding fair value hedge basis adjustment	328,121		336,474
Current period gross charge-offs, in current fiscal year	0		38
Current period gross charge-offs, in prior year	234		1,503
Current period gross charge-offs, two years prior	615		985
Current period gross charge-offs, three years prior	304		419
Current period gross charge-offs, four years prior	149		279
Current period gross charge-offs, five or more years prior	305		690
Revolvers	0		0
Revolvers converted to term loans	0		0
Current period gross charge-offs, Total	1,607		3,914
Residential | Manufactured housing | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	0		45,065
Originated in prior year	43,191		69,424
Originated two years prior	67,155		48,814
Originated three years prior	47,387		43,735
Originated four years prior	42,030		31,321
Originated five or more years prior	106,805		80,284
Revolvers	0		0
Revolvers converted to term loans	0		0
Total loans excluding fair value hedge basis adjustment	306,568		318,643
Residential | Manufactured housing | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	128		1,078
Originated in prior year	2,018		4,665
Originated two years prior	5,055		3,601
Originated three years prior	3,903		3,020
Originated four years prior	3,816		1,291
Originated five or more years prior	6,633		4,176
Revolvers	0		0
Revolvers converted to term loans	0		0
Total loans excluding fair value hedge basis adjustment	21,553		17,831
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	27,586		86,192
Originated in prior year	71,681		39,648
Originated two years prior	33,723		16,244
Originated three years prior	13,735		10,375
Originated four years prior	9,530		1,217
Originated five or more years prior	1,318		636
Revolvers	22,067		26,271
Revolvers converted to term loans	462		534
Total loans excluding fair value hedge basis adjustment	180,102		181,117
Current period gross charge-offs, in current fiscal year	648		3,245
Current period gross charge-offs, in prior year	55		241
Current period gross charge-offs, two years prior	86		233
Current period gross charge-offs, three years prior	18		38
Current period gross charge-offs, four years prior	5		15
Current period gross charge-offs, five or more years prior	0		1
Revolvers	0		5
Revolvers converted to term loans	49		204
Current period gross charge-offs, Total	861		3,982
Consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	27,459		86,142
Originated in prior year	71,656		39,593
Originated two years prior	33,669		16,191
Originated three years prior	13,687		10,350
Originated four years prior	9,517		1,212
Originated five or more years prior	1,309		623
Revolvers	22,067		26,239
Revolvers converted to term loans	462		534
Total loans excluding fair value hedge basis adjustment	179,826		180,884
Consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in current fiscal year	127		50
Originated in prior year	25		55
Originated two years prior	54		53
Originated three years prior	48		25
Originated four years prior	13		5
Originated five or more years prior	9		13
Revolvers	0		32
Revolvers converted to term loans	0		0
Total loans excluding fair value hedge basis adjustment	$ 276		$ 233