Loans Held for Investment - Internal Risk Grading System under ASC 326 (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 278,799		$ 278,799		$ 3,033,849
Fiscal year before current fiscal year	2,943,232		2,943,232		4,237,198
Two years before current fiscal year	3,884,842		3,884,842		1,402,650
Three years before current fiscal year	1,258,594		1,258,594		1,788,312
Four years before current fiscal year	1,595,614		1,595,614		861,690
Prior	2,527,853		2,527,853		2,206,015
Revolving	810,040		810,040		1,203,904
Revolving Converted to Term During the Period	19,976		19,976		4,606
Total	13,318,950		13,318,950		14,738,224
Current fiscal year charge off			56
One year before current fiscal year charge off			3,003
Two year before current fiscal year charge off			597
Three year before current fiscal year charge off			196
Four year before current fiscal year charge off			356
Prior year before current fiscal year charge off			5,719
Revolving charge off			4,781
Revolving Converted to Term During the Period charge off			503
Total	7,561	$ 1,318	15,211	$ 9,448
Loans held for investment	13,270,120		13,270,120		14,676,298
Basis adjustment associated with fair value hedge
Financing Receivable, Credit Quality Indicator [Line Items]
Total	13,318,950		13,318,950		14,738,224
Basis adjustment associated with fair value hedge	48,830		48,830		61,926
Investor loans secured by real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	197,483		197,483		1,948,392
Fiscal year before current fiscal year	1,987,312		1,987,312		2,954,826
Two years before current fiscal year	2,761,099		2,761,099		1,034,449
Three years before current fiscal year	930,638		930,638		1,268,038
Four years before current fiscal year	1,181,253		1,181,253		590,859
Prior	1,657,811		1,657,811		1,416,489
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		463
Total	8,715,596		8,715,596		9,213,516
Current fiscal year charge off			0
One year before current fiscal year charge off			0
Two year before current fiscal year charge off			217
Three year before current fiscal year charge off			0
Four year before current fiscal year charge off			0
Prior year before current fiscal year charge off			2,838
Revolving charge off			0
Revolving Converted to Term During the Period charge off			0
Total			3,055
Loans held for investment	8,715,596		8,715,596		9,213,516
Investor loans secured by real estate \| CRE non-owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,514,056		2,514,056		2,660,321
Total	0	1,128	2,657	1,128
Loans held for investment	2,514,056		2,514,056		2,660,321
Investor loans secured by real estate \| CRE non-owner-occupied \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	67,798		67,798		523,895
Fiscal year before current fiscal year	506,175		506,175		607,153
Two years before current fiscal year	568,747		568,747		208,760
Three years before current fiscal year	194,206		194,206		347,889
Four years before current fiscal year	317,648		317,648		308,317
Prior	820,980		820,980		651,593
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	2,475,554		2,475,554		2,647,607
Investor loans secured by real estate \| CRE non-owner-occupied \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before current fiscal year	3,829		3,829		0
Two years before current fiscal year	2,550		2,550		0
Three years before current fiscal year	0		0		0
Four years before current fiscal year	0		0		7,487
Prior	626		626		0
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	7,005		7,005		7,487
Investor loans secured by real estate \| CRE non-owner-occupied \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before current fiscal year	425		425		0
Two years before current fiscal year	0		0		0
Three years before current fiscal year	0		0		0
Four years before current fiscal year	0		0		194
Prior	31,072		31,072		4,570
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		463
Total	31,497		31,497		5,227
Investor loans secured by real estate \| Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Total	5,719,210		5,719,210		6,112,026
Total	0	0	290	0
Loans held for investment	5,719,210		5,719,210		6,112,026
Investor loans secured by real estate \| Multifamily \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	79,680		79,680		1,230,359
Fiscal year before current fiscal year	1,199,616		1,199,616		2,187,255
Two years before current fiscal year	2,076,199		2,076,199		786,436
Three years before current fiscal year	733,724		733,724		889,737
Four years before current fiscal year	841,189		841,189		263,241
Prior	776,086		776,086		732,808
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	5,706,494		5,706,494		6,089,836
Investor loans secured by real estate \| Multifamily \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before current fiscal year	0		0		0
Two years before current fiscal year	0		0		0
Three years before current fiscal year	0		0		12,667
Four years before current fiscal year	0		0		0
Prior	234		234		0
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	234		234		12,667
Investor loans secured by real estate \| Multifamily \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before current fiscal year	0		0		6,057
Two years before current fiscal year	0		0		0
Three years before current fiscal year	0		0		2,723
Four years before current fiscal year	12,482		12,482		0
Prior	0		0		743
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	12,482		12,482		9,523
Investor loans secured by real estate \| Construction and land
Financing Receivable, Credit Quality Indicator [Line Items]
Total	444,576		444,576		399,034
Total	0	0	0	0
Loans held for investment	444,576		444,576		399,034
Investor loans secured by real estate \| Construction and land \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	50,005		50,005		187,567
Fiscal year before current fiscal year	270,767		270,767		154,231
Two years before current fiscal year	113,473		113,473		38,760
Three years before current fiscal year	2,215		2,215		9,615
Four years before current fiscal year	4,585		4,585		1,843
Prior	3,531		3,531		7,018
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	444,576		444,576		399,034
Investor loans secured by real estate \| SBA secured by real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	37,754		37,754		42,135
Total	108	0	108	70
Loans held for investment	37,754		37,754		42,135
Investor loans secured by real estate \| SBA secured by real estate \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		6,571
Fiscal year before current fiscal year	6,500		6,500		130
Two years before current fiscal year	130		130		493
Three years before current fiscal year	493		493		5,407
Four years before current fiscal year	4,814		4,814		7,361
Prior	17,406		17,406		13,199
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	29,343		29,343		33,161
Investor loans secured by real estate \| SBA secured by real estate \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before current fiscal year	0		0		0
Two years before current fiscal year	0		0		0
Three years before current fiscal year	0		0		0
Four years before current fiscal year	535		535		2,416
Prior	7,876		7,876		6,558
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	8,411		8,411		8,974
Business loans secured by real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	26,905		26,905		676,516
Fiscal year before current fiscal year	641,880		641,880		873,443
Two years before current fiscal year	812,508		812,508		289,937
Three years before current fiscal year	262,158		262,158		299,206
Four years before current fiscal year	248,985		248,985		158,541
Prior	602,566		602,566		568,284
Revolving	919		919		5,661
Revolving Converted to Term During the Period	0		0		0
Total	2,595,921		2,595,921		2,871,588
Current fiscal year charge off			0
One year before current fiscal year charge off			0
Two year before current fiscal year charge off			318
Three year before current fiscal year charge off			191
Four year before current fiscal year charge off			0
Prior year before current fiscal year charge off			1,861
Revolving charge off			0
Revolving Converted to Term During the Period charge off			0
Total			2,370
Loans held for investment	2,595,921		2,595,921		2,871,588
Business loans secured by real estate \| SBA secured by real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	53,668		53,668		61,368
Total	0	0	0	0
Loans held for investment	53,668		53,668		61,368
Business loans secured by real estate \| SBA secured by real estate \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	114		114		10,993
Fiscal year before current fiscal year	9,375		9,375		6,978
Two years before current fiscal year	7,944		7,944		2,329
Three years before current fiscal year	2,127		2,127		5,710
Four years before current fiscal year	4,124		4,124		4,440
Prior	24,050		24,050		25,415
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	47,734		47,734		55,865
Business loans secured by real estate \| SBA secured by real estate \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before current fiscal year	535		535		0
Two years before current fiscal year	0		0		0
Three years before current fiscal year	0		0		0
Four years before current fiscal year	0		0		0
Prior	84		84		118
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	619		619		118
Business loans secured by real estate \| SBA secured by real estate \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before current fiscal year	0		0		0
Two years before current fiscal year	0		0		0
Three years before current fiscal year	0		0		0
Four years before current fiscal year	0		0		1,354
Prior	5,315		5,315		4,031
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	5,315		5,315		5,385
Business loans secured by real estate \| CRE owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,228,802		2,228,802		2,432,163
Total	0	0	2,370	0
Loans held for investment	2,228,802		2,228,802		2,432,163
Business loans secured by real estate \| CRE owner-occupied \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	16,141		16,141		593,826
Fiscal year before current fiscal year	558,149		558,149		718,223
Two years before current fiscal year	672,134		672,134		242,125
Three years before current fiscal year	228,971		228,971		240,772
Four years before current fiscal year	219,389		219,389		114,581
Prior	471,819		471,819		448,531
Revolving	919		919		5,661
Revolving Converted to Term During the Period	0		0		0
Total	2,167,522		2,167,522		2,363,719
Business loans secured by real estate \| CRE owner-occupied \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		334
Fiscal year before current fiscal year	15,406		15,406		1,015
Two years before current fiscal year	0		0		0
Three years before current fiscal year	0		0		0
Four years before current fiscal year	4,062		4,062		675
Prior	15,343		15,343		327
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	34,811		34,811		2,351
Business loans secured by real estate \| CRE owner-occupied \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		10,838
Fiscal year before current fiscal year	10,270		10,270		2,541
Two years before current fiscal year	2,178		2,178		11,970
Three years before current fiscal year	4,131		4,131		2,403
Four years before current fiscal year	324		324		4,676
Prior	9,566		9,566		33,665
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	26,469		26,469		66,093
Business loans secured by real estate \| Franchise real estate secured
Financing Receivable, Credit Quality Indicator [Line Items]
Total	313,451		313,451		378,057
Total	0	0	0	0
Loans held for investment	313,451		313,451		378,057
Business loans secured by real estate \| Franchise real estate secured \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	10,650		10,650		54,654
Fiscal year before current fiscal year	39,567		39,567		131,541
Two years before current fiscal year	126,459		126,459		33,513
Three years before current fiscal year	26,929		26,929		44,229
Four years before current fiscal year	16,453		16,453		32,815
Prior	74,462		74,462		55,893
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	294,520		294,520		352,645
Business loans secured by real estate \| Franchise real estate secured \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		4,891
Fiscal year before current fiscal year	7,635		7,635		13,145
Two years before current fiscal year	3,793		3,793		0
Three years before current fiscal year	0		0		0
Four years before current fiscal year	809		809		0
Prior	1,634		1,634		0
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	13,871		13,871		18,036
Business loans secured by real estate \| Franchise real estate secured \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		980
Fiscal year before current fiscal year	943		943		0
Two years before current fiscal year	0		0		0
Three years before current fiscal year	0		0		6,092
Four years before current fiscal year	3,824		3,824		0
Prior	293		293		304
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	5,060		5,060		7,376
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	54,391		54,391		408,941
Fiscal year before current fiscal year	314,040		314,040		408,923
Two years before current fiscal year	311,232		311,232		78,071
Three years before current fiscal year	65,617		65,617		221,057
Four years before current fiscal year	165,369		165,369		112,268
Prior	222,060		222,060		170,512
Revolving	781,806		781,806		1,172,924
Revolving Converted to Term During the Period	19,976		19,976		4,143
Total	1,934,491		1,934,491		2,576,839
Current fiscal year charge off			56
One year before current fiscal year charge off			3,003
Two year before current fiscal year charge off			62
Three year before current fiscal year charge off			5
Four year before current fiscal year charge off			356
Prior year before current fiscal year charge off			37
Revolving charge off			4,779
Revolving Converted to Term During the Period charge off			503
Total			8,801
Loans held for investment	1,934,491		1,934,491		2,576,839
Commercial loans \| Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,588,771		1,588,771		2,160,948
Total	7,386	190	8,734	7,750
Loans held for investment	1,588,771		1,588,771		2,160,948
Commercial loans \| Commercial and industrial \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	46,478		46,478		282,131
Fiscal year before current fiscal year	188,940		188,940		262,044
Two years before current fiscal year	177,244		177,244		55,659
Three years before current fiscal year	45,146		45,146		155,310
Four years before current fiscal year	115,645		115,645		78,684
Prior	155,222		155,222		121,918
Revolving	711,808		711,808		1,134,568
Revolving Converted to Term During the Period	5,343		5,343		3,412
Total	1,445,826		1,445,826		2,093,726
Commercial loans \| Commercial and industrial \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		15,105
Fiscal year before current fiscal year	28,423		28,423		3,567
Two years before current fiscal year	12,402		12,402		798
Three years before current fiscal year	155		155		0
Four years before current fiscal year	27		27		1,864
Prior	2,163		2,163		41
Revolving	58,905		58,905		9,898
Revolving Converted to Term During the Period	77		77		0
Total	102,152		102,152		31,273
Commercial loans \| Commercial and industrial \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		2,590
Fiscal year before current fiscal year	6,795		6,795		80
Two years before current fiscal year	2,931		2,931		0
Three years before current fiscal year	642		642		3,867
Four years before current fiscal year	179		179		562
Prior	1,184		1,184		1,029
Revolving	11,093		11,093		27,680
Revolving Converted to Term During the Period	13,000		13,000		141
Total	35,824		35,824		35,949
Commercial loans \| Commercial and industrial \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		0
2022	4,187		4,187
2021	0		0
2020	0		0
2019	0		0
Prior	0		0
Revolving	0		0
Revolving Converted to Term During the Period	782		782
Loans held for investment	4,969		4,969
Commercial loans \| Franchise non-real estate secured
Financing Receivable, Credit Quality Indicator [Line Items]
Total	335,053		335,053		404,791
Total	0	0	0	448
Loans held for investment	335,053		335,053		404,791
Commercial loans \| Franchise non-real estate secured \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	6,963		6,963		102,542
Fiscal year before current fiscal year	76,818		76,818		128,030
Two years before current fiscal year	116,268		116,268		18,486
Three years before current fiscal year	16,897		16,897		46,027
Four years before current fiscal year	36,419		36,419		28,664
Prior	58,279		58,279		43,486
Revolving	0		0		778
Revolving Converted to Term During the Period	774		774		0
Total	312,418		312,418		368,013
Commercial loans \| Franchise non-real estate secured \| Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	442		442		1,372
Fiscal year before current fiscal year	866		866		14,382
Two years before current fiscal year	1,702		1,702		0
Three years before current fiscal year	0		0		11,829
Four years before current fiscal year	651		651		0
Prior	735		735		0
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	4,396		4,396		27,583
Commercial loans \| Franchise non-real estate secured \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		1,757
Fiscal year before current fiscal year	2,914		2,914		385
Two years before current fiscal year	338		338		2,852
Three years before current fiscal year	2,517		2,517		2,256
Four years before current fiscal year	10,875		10,875		1,637
Prior	1,595		1,595		308
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	18,239		18,239		9,195
Commercial loans \| SBA non-real estate secured
Financing Receivable, Credit Quality Indicator [Line Items]
Total	10,667		10,667		11,100
Total	67	0	67	50
Loans held for investment	10,667		10,667		11,100
Commercial loans \| SBA non-real estate secured \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	508		508		3,444
Fiscal year before current fiscal year	4,559		4,559		435
Two years before current fiscal year	347		347		276
Three years before current fiscal year	116		116		1,638
Four years before current fiscal year	1,518		1,518		633
Prior	2,628		2,628		3,124
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	9,676		9,676		9,550
Commercial loans \| SBA non-real estate secured \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before current fiscal year	538		538		0
Two years before current fiscal year	0		0		0
Three years before current fiscal year	144		144		130
Four years before current fiscal year	55		55		224
Prior	254		254		606
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		590
Total	991		991		1,550
Retail loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	20		20		0
Fiscal year before current fiscal year	0		0		6
Two years before current fiscal year	3		3		193
Three years before current fiscal year	181		181		11
Four years before current fiscal year	7		7		22
Prior	45,416		45,416		50,730
Revolving	27,315		27,315		25,319
Revolving Converted to Term During the Period	0		0		0
Total	72,942		72,942		76,281
Current fiscal year charge off			0
One year before current fiscal year charge off			0
Two year before current fiscal year charge off			0
Three year before current fiscal year charge off			0
Four year before current fiscal year charge off			0
Prior year before current fiscal year charge off			983
Revolving charge off			2
Revolving Converted to Term During the Period charge off			0
Total			985
Loans held for investment	72,942		72,942		76,281
Retail loans \| Single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Total	70,984		70,984		72,997
Total	0	0	90	0
Loans held for investment	70,984		70,984		72,997
Retail loans \| Single family residential \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	20		20		0
Fiscal year before current fiscal year	0		0		0
Two years before current fiscal year	0		0		176
Three years before current fiscal year	170		170		0
Four years before current fiscal year	0		0		22
Prior	44,607		44,607		49,729
Revolving	26,186		26,186		23,065
Revolving Converted to Term During the Period	0		0		0
Total	70,983		70,983		72,992
Retail loans \| Single family residential \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before current fiscal year	0		0		0
Two years before current fiscal year	0		0		0
Three years before current fiscal year	0		0		0
Four years before current fiscal year	0		0		0
Prior	1		1		5
Revolving	0		0		0
Revolving Converted to Term During the Period	0		0		0
Total	1		1		5
Retail loans \| Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,958		1,958		3,284
Total	0	$ 0	895	$ 2
Loans held for investment	1,958		1,958		3,284
Retail loans \| Consumer \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0		0		0
Fiscal year before current fiscal year	0		0		6
Two years before current fiscal year	3		3		17
Three years before current fiscal year	11		11		11
Four years before current fiscal year	7		7		0
Prior	808		808		969
Revolving	1,129		1,129		2,254
Revolving Converted to Term During the Period	0		0		0
Total	$ 1,958		$ 1,958		3,257
Retail loans \| Consumer \| Substandard

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