Allowance for Credit Losses (ACL) - Disaggregated analysis of the changes in allowance for credit losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Allowance for credit losses
Balance at beginning of period	$ 319,708	$ 350,401	$ 301,807	$ 457,309
Charge-offs	(7,126)	(3,847)	(18,779)	(12,883)
Recoveries	8,388	3,801	15,379	10,744
Net (charge-offs) recoveries	1,262	(46)	(3,400)	(2,139)
Provision (recovery)	3,428	(36,211)	(1,464)	(141,026)
Balance at end of period	324,398	314,144	324,398	314,144
Quantitative allowance
Collectively evaluated	309,245	297,728	309,245	297,728
Individually evaluated	13,278	1,726	13,278	1,726
Total quantitative allowance	322,523	299,454	322,523	299,454
Qualitative allowance	1,875	14,690	1,875	14,690
Unfunded Commitment
Allowance for credit losses
Provision (recovery)	20,000	(2,700)	22,500	(15,100)
Initial PCD Allowance
Allowance for credit losses
Balance at end of period	13,758		13,758
Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period	13,697		13,697
Residential Mortgage Sr.
Allowance for credit losses
Balance at beginning of period	55,707	55,820	47,036	63,561
Charge-offs	(50)	(15)	(169)	(204)
Recoveries	376	332	1,131	1,103
Net (charge-offs) recoveries	326	317	962	899
Provision (recovery)	11,987	(4,587)	18,859	(12,910)
Balance at end of period	68,020	51,550	68,020	51,550
Quantitative allowance
Collectively evaluated	67,765	48,411	67,765	48,411
Individually evaluated	233	77	233	77
Total quantitative allowance	67,998	48,488	67,998	48,488
Qualitative allowance	22	3,062	22	3,062
Residential Mortgage Sr. | Initial PCD Allowance
Allowance for credit losses
Balance at end of period	811		811
Residential Mortgage Sr. | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period	352		352
Residential Mortgage Jr.
Allowance for credit losses
Balance at beginning of period	533	825	611	1,238
Charge-offs			(19)
Recoveries	30	48	195	131
Net (charge-offs) recoveries	30	48	176	131
Provision (recovery)	(40)	(174)	(290)	(670)
Balance at end of period	523	699	523	699
Quantitative allowance
Collectively evaluated	523	699	523	699
Total quantitative allowance	523	699	523	699
Residential Mortgage Jr. | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period	26		26
HELOC
Allowance for credit losses
Balance at beginning of period	16,918	14,550	13,325	16,698
Charge-offs	(23)	(149)	(444)	(835)
Recoveries	3,151	720	3,803	1,903
Net (charge-offs) recoveries	3,128	571	3,359	1,068
Provision (recovery)	(3,980)	(204)	(750)	(2,849)
Balance at end of period	16,066	14,917	16,066	14,917
Quantitative allowance
Collectively evaluated	13,402	13,307	13,402	13,307
Individually evaluated	2,654	959	2,654	959
Total quantitative allowance	16,056	14,266	16,056	14,266
Qualitative allowance	10	651	10	651
HELOC | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period	132		132
Residential Construction
Allowance for credit losses
Balance at beginning of period	7,565	4,488	4,997	4,914
Recoveries	2	2	7	3
Net (charge-offs) recoveries	2	2	7	3
Provision (recovery)	763	295	3,324	(132)
Balance at end of period	8,330	4,785	8,330	4,785
Quantitative allowance
Collectively evaluated	8,330	4,756	8,330	4,756
Total quantitative allowance	8,330	4,756	8,330	4,756
Qualitative allowance		29		29
Residential Construction | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period	2		2
Other C&D
Allowance for credit losses
Balance at beginning of period	27,730	45,488	37,593	67,197
Charge-offs			(4)	(87)
Recoveries	280	748	924	1,178
Net (charge-offs) recoveries	280	748	920	1,091
Provision (recovery)	3,798	(10,337)	(8,678)	(32,389)
Balance at end of period	31,808	35,899	31,808	35,899
Quantitative allowance
Collectively evaluated	31,524	35,893	31,524	35,893
Individually evaluated	284	6	284	6
Total quantitative allowance	31,808	35,899	31,808	35,899
Other C&D | Initial PCD Allowance
Allowance for credit losses
Balance at end of period	86		86
Other C&D | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period	1,887		1,887
Consumer
Allowance for credit losses
Balance at beginning of period	24,752	25,697	23,149	26,562
Charge-offs	(2,742)	(2,366)	(7,527)	(6,001)
Recoveries	573	577	1,765	1,618
Net (charge-offs) recoveries	(2,169)	(1,789)	(5,762)	(4,383)
Provision (recovery)	4,221	332	9,366	2,061
Balance at end of period	26,804	24,240	26,804	24,240
Quantitative allowance
Collectively evaluated	26,804	21,509	26,804	21,509
Total quantitative allowance	26,804	21,509	26,804	21,509
Qualitative allowance		2,731		2,731
Consumer | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period	51		51
Multifamily
Allowance for credit losses
Balance at beginning of period	2,458	5,883	4,921	7,887
Recoveries				3
Net (charge-offs) recoveries				3
Provision (recovery)	666	(1,299)	(2,223)	(3,306)
Balance at end of period	3,124	4,584	3,124	4,584
Quantitative allowance
Collectively evaluated	3,124	4,584	3,124	4,584
Total quantitative allowance	3,124	4,584	3,124	4,584
Multifamily | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period	426		426
Municipal
Allowance for credit losses
Balance at beginning of period	703	1,063	565	1,510
Provision (recovery)	(1)	(554)	137	(1,001)
Balance at end of period	702	509	702	509
Quantitative allowance
Collectively evaluated	702	509	702	509
Total quantitative allowance	702	509	702	509
CRE Owner Occupied
Allowance for credit losses
Balance at beginning of period	64,688	75,492	61,794	97,104
Charge-offs	(1,353)	(4)	(1,802)	(2,052)
Recoveries	569	332	977	796
Net (charge-offs) recoveries	(784)	328	(825)	(1,256)
Provision (recovery)	(9,745)	(10,611)	(11,738)	(30,639)
Balance at end of period	54,159	65,209	54,159	65,209
Quantitative allowance
Collectively evaluated	46,443	62,969	46,443	62,969
Individually evaluated	7,102	377	7,102	377
Total quantitative allowance	53,545	63,346	53,545	63,346
Qualitative allowance	614	1,863	614	1,863
CRE Owner Occupied | Initial PCD Allowance
Allowance for credit losses
Balance at end of period	2,409		2,409
CRE Owner Occupied | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period	2,519		2,519
Non Owner Occupied CRE
Allowance for credit losses
Balance at beginning of period	85,169	90,404	79,649	124,421
Charge-offs	(8)	(241)	(368)	(776)
Recoveries	29	173	402	905
Net (charge-offs) recoveries	21	(68)	34	129
Provision (recovery)	(8,937)	(7,458)	(6,127)	(41,672)
Balance at end of period	76,253	82,878	76,253	82,878
Quantitative allowance
Collectively evaluated	74,978	79,302	74,978	79,302
Individually evaluated	765		765
Total quantitative allowance	75,743	79,302	75,743	79,302
Qualitative allowance	510	3,576	510	3,576
Non Owner Occupied CRE | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period	2,697		2,697
C & I
Allowance for credit losses
Balance at beginning of period	33,485	30,691	28,167	46,217
Charge-offs	(2,950)	(1,072)	(8,446)	(2,928)
Recoveries	3,378	869	6,175	3,104
Net (charge-offs) recoveries	428	(203)	(2,271)	176
Provision (recovery)	4,696	(1,614)	(3,344)	(17,519)
Balance at end of period	38,609	28,874	38,609	28,874
Quantitative allowance
Collectively evaluated	35,650	25,789	35,650	25,789
Individually evaluated	2,240	307	2,240	307
Total quantitative allowance	37,890	26,096	37,890	26,096
Qualitative allowance	719	$ 2,778	719	$ 2,778
C & I | Initial PCD Allowance
Allowance for credit losses
Balance at end of period	10,452		10,452
C & I | Initial Non PCD Allowance
Allowance for credit losses
Balance at end of period	$ 5,605		$ 5,605