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Loans and Leases Receivable and Allowance for Credit Losses - Credit Ratings (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	$ 634,369	$ 1,515,239
Fiscal year before current fiscal year	1,385,869	1,599,431
Two years before current fiscal year	1,373,910	786,506
Three years before current fiscal year	738,407	1,055,134
Four years before current fiscal year	930,852	578,390
Prior	1,606,409	1,130,969
Revolving loans amortized cost basis	866,673	909,699
Revolving loans converted to term	0	0
Total loans and leases receivable	7,536,489	7,575,368
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	5,802,692	5,960,549
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	1,733,797	1,614,819
Commercial loans and leases receivable | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	427,431	1,188,773
Fiscal year before current fiscal year	897,562	791,958
Two years before current fiscal year	756,848	663,454
Three years before current fiscal year	633,552	1,038,646
Four years before current fiscal year	918,950	538,340
Prior	1,435,161	994,535
Revolving loans amortized cost basis	733,188	744,843
Revolving loans converted to term	0	0
Total loans and leases receivable	5,802,692	5,960,549
Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	1,640,278	1,761,301
Multi-family | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	90,497	150,835
Fiscal year before current fiscal year	130,496	23,716
Two years before current fiscal year	22,678	299,319
Three years before current fiscal year	275,379	590,608
Four years before current fiscal year	488,722	245,946
Prior	632,506	450,877
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	1,640,278	1,761,301
Multi-family | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	90,497	150,835
Fiscal year before current fiscal year	130,496	23,716
Two years before current fiscal year	22,678	299,319
Three years before current fiscal year	275,379	535,510
Four years before current fiscal year	418,365	227,296
Prior	565,953	420,809
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	1,503,368	1,657,485
Multi-family | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	20,901
Four years before current fiscal year	20,279	10,394
Prior	36,870	26,708
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	57,149	58,003
Multi-family | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	34,197
Four years before current fiscal year	50,078	8,256
Prior	29,683	3,360
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	79,761	45,813
Multi-family | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year		0
Prior		0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	0	0
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	2,220,652	2,289,441
Commercial and industrial | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	291,633	752,438
Fiscal year before current fiscal year	472,653	381,057
Two years before current fiscal year	343,155	161,444
Three years before current fiscal year	158,476	122,807
Four years before current fiscal year	116,274	54,201
Prior	120,631	74,245
Revolving loans amortized cost basis	717,830	743,249
Revolving loans converted to term	0	0
Total loans and leases receivable	2,220,652	2,289,441
Commercial and industrial | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	274,698	729,270
Fiscal year before current fiscal year	448,597	373,050
Two years before current fiscal year	335,492	141,943
Three years before current fiscal year	139,864	116,793
Four years before current fiscal year	109,093	45,367
Prior	112,621	71,502
Revolving loans amortized cost basis	692,981	717,007
Revolving loans converted to term	0	0
Total loans and leases receivable	2,113,346	2,194,932
Commercial and industrial | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	16,935	13,200
Fiscal year before current fiscal year	13,200	1,117
Two years before current fiscal year	1,044	436
Three years before current fiscal year	563	113
Four years before current fiscal year	33	516
Prior	258	21
Revolving loans amortized cost basis	16,342	17,524
Revolving loans converted to term	0	0
Total loans and leases receivable	48,375	32,927
Commercial and industrial | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	9,968
Fiscal year before current fiscal year	10,856	6,890
Two years before current fiscal year	6,619	19,065
Three years before current fiscal year	18,049	5,901
Four years before current fiscal year	7,148	8,318
Prior	7,752	2,722
Revolving loans amortized cost basis	8,507	8,718
Revolving loans converted to term	0	0
Total loans and leases receivable	58,931	61,582
Commercial and industrial | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior		0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	0	0
Commercial real estate owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	590,093	572,338
Commercial real estate owner occupied | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	33,144	82,343
Fiscal year before current fiscal year	82,661	176,289
Two years before current fiscal year	174,621	82,114
Three years before current fiscal year	80,684	80,040
Four years before current fiscal year	72,811	48,741
Prior	145,500	102,070
Revolving loans amortized cost basis	672	741
Revolving loans converted to term	0	0
Total loans and leases receivable	590,093	572,338
Commercial real estate owner occupied | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	33,144	82,343
Fiscal year before current fiscal year	82,661	168,977
Two years before current fiscal year	167,487	72,615
Three years before current fiscal year	71,146	70,642
Four years before current fiscal year	61,561	46,510
Prior	133,469	91,798
Revolving loans amortized cost basis	672	741
Revolving loans converted to term	0	0
Total loans and leases receivable	550,140	533,626
Commercial real estate owner occupied | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	4,464
Two years before current fiscal year	4,286	0
Three years before current fiscal year	0	9,056
Four years before current fiscal year	11,010	0
Prior	292	555
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	15,588	14,075
Commercial real estate owner occupied | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	2,848
Two years before current fiscal year	2,848	9,499
Three years before current fiscal year	9,538	342
Four years before current fiscal year	240	2,231
Prior	11,739	9,717
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	24,365	24,637
Commercial real estate owner occupied | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	0	0
Commercial real estate non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	1,194,832	1,196,564
Commercial real estate non-owner occupied | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	11,186	183,225
Fiscal year before current fiscal year	182,074	105,430
Two years before current fiscal year	105,421	115,623
Three years before current fiscal year	114,092	245,191
Four years before current fiscal year	241,143	179,752
Prior	526,897	367,343
Revolving loans amortized cost basis	14,019	0
Revolving loans converted to term	0	0
Total loans and leases receivable	1,194,832	1,196,564
Commercial real estate non-owner occupied | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	11,186	143,231
Fiscal year before current fiscal year	120,080	105,430
Two years before current fiscal year	94,136	97,882
Three years before current fiscal year	95,355	157,835
Four years before current fiscal year	120,861	155,168
Prior	423,438	313,559
Revolving loans amortized cost basis	14,019	0
Revolving loans converted to term	0	0
Total loans and leases receivable	879,075	973,105
Commercial real estate non-owner occupied | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	39,994
Fiscal year before current fiscal year	61,994	0
Two years before current fiscal year	11,285	0
Three years before current fiscal year	996	66,745
Four years before current fiscal year	99,671	24,218
Prior	53,340	14,613
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	227,286	145,570
Commercial real estate non-owner occupied | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	17,741
Three years before current fiscal year	17,741	20,611
Four years before current fiscal year	20,611	366
Prior	50,119	39,171
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	88,471	77,889
Commercial real estate non-owner occupied | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0
Three years before current fiscal year		0
Four years before current fiscal year	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	0	0
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	156,837	140,905
Construction | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	971	19,932
Fiscal year before current fiscal year	29,678	105,466
Two years before current fiscal year	110,973	4,954
Three years before current fiscal year	4,921	0
Four years before current fiscal year	0	9,700
Prior	9,627	0
Revolving loans amortized cost basis	667	853
Revolving loans converted to term	0	0
Total loans and leases receivable	156,837	140,905
Construction | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	971	19,932
Fiscal year before current fiscal year	28,168	105,466
Two years before current fiscal year	110,973	4,954
Three years before current fiscal year	4,921	0
Four years before current fiscal year	0	9,700
Prior	9,627	0
Revolving loans amortized cost basis	667	853
Revolving loans converted to term	0	0
Total loans and leases receivable	155,327	140,905
Construction | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	1,510	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	1,510	0
Construction | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	0	0
Construction | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	0	0
Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	206,938	326,466
Fiscal year before current fiscal year	488,307	807,473
Two years before current fiscal year	617,062	123,052
Three years before current fiscal year	104,855	16,488
Four years before current fiscal year	11,902	40,050
Prior	171,248	136,434
Revolving loans amortized cost basis	133,485	164,856
Revolving loans converted to term	0	0
Total loans and leases receivable	1,733,797	1,614,819
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	293,805	317,170
Residential real estate | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,573	6,708
Fiscal year before current fiscal year	11,110	13,617
Two years before current fiscal year	14,758	6,970
Three years before current fiscal year	12,966	11,635
Four years before current fiscal year	8,159	39,493
Prior	110,754	73,891
Revolving loans amortized cost basis	133,485	164,856
Revolving loans converted to term	0	0
Total loans and leases receivable	293,805	317,170
Residential real estate | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,573	6,708
Fiscal year before current fiscal year	11,110	13,617
Two years before current fiscal year	14,660	6,810
Three years before current fiscal year	12,060	10,850
Four years before current fiscal year	7,379	38,143
Prior	105,969	69,496
Revolving loans amortized cost basis	131,018	161,576
Revolving loans converted to term	0	0
Total loans and leases receivable	284,769	307,200
Residential real estate | Consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	98	160
Three years before current fiscal year	906	785
Four years before current fiscal year	780	1,350
Prior	4,785	4,395
Revolving loans amortized cost basis	2,467	3,280
Revolving loans converted to term	0	0
Total loans and leases receivable	9,036	9,970
Manufactured housing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	59,977	62,243
Manufactured housing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	295
Two years before current fiscal year	300	609
Three years before current fiscal year	443	76
Four years before current fiscal year	77	41
Prior	59,157	61,222
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	59,977	62,243
Manufactured housing | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	295
Two years before current fiscal year	300	609
Three years before current fiscal year	443	76
Four years before current fiscal year	77	41
Prior	54,394	56,837
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	55,214	57,858
Manufactured housing | Consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	4,763	4,385
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	4,763	4,385
Installment
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans and leases receivable	1,380,015	1,235,406
Installment | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	204,365	319,758
Fiscal year before current fiscal year	477,197	793,561
Two years before current fiscal year	602,004	115,473
Three years before current fiscal year	91,446	4,777
Four years before current fiscal year	3,666	516
Prior	1,337	1,321
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	1,380,015	1,235,406
Installment | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	204,365	319,453
Fiscal year before current fiscal year	476,856	791,235
Two years before current fiscal year	599,887	114,988
Three years before current fiscal year	91,009	4,736
Four years before current fiscal year	3,633	514
Prior	1,249	1,204
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	1,376,999	1,232,130
Installment | Consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	305
Fiscal year before current fiscal year	341	2,326
Two years before current fiscal year	2,117	485
Three years before current fiscal year	437	41
Four years before current fiscal year	33	2
Prior	88	117
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total loans and leases receivable	$ 3,016	$ 3,276

X

- Definition

Amount of financing receivable originated more than five years prior to current fiscal year.

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Amount of financing receivable originated three years prior to current fiscal year.

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Amount of financing receivable originated two years prior to current fiscal year.

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Amount of financing receivable that can be withdrawn, repaid and redrawn.

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