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Loans Receivable and Allowance for Credit Losses - Financing Receivable Credit Quality Indicators (Details) - USD ($) | Sep. 30, 2022 | Dec. 31, 2021
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Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | $ 4,414,801,000 | $ 4,569,237,000
Term loan originated in year two | 3,807,693,000 | 1,949,984,000
Term loan originated in year three | 1,758,520,000 | 1,864,273,000
Term loan originated in year four | 1,508,595,000 | 1,586,677,000
Term loan originated in year five | 1,223,725,000 | 1,126,085,000
Term loan originated prior to year five | 1,581,304,000 | 1,427,092,000
Revolving Loans | 1,196,549,000 | 1,429,395,000
Total loans | 15,491,187,000 | 13,952,743,000
Revolving loans converted to term loans | 0 | 0
Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 9,504,893,000 | 9,105,931,000
Commercial business |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 1,920,257,000 | 1,760,279,000
Term loan originated in year two | 1,237,939,000 | 432,609,000
Term loan originated in year three | 347,416,000 | 468,548,000
Term loan originated in year four | 353,961,000 | 103,360,000
Term loan originated in year five | 77,700,000 | 57,982,000
Term loan originated prior to year five | 109,585,000 | 78,838,000
Revolving Loans | 1,077,563,000 | 1,307,058,000
Total loans | 5,124,421,000 | 4,208,674,000
Residential Portfolio Segment |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 346,195,000 | 282,466,000
Term loan originated in year two | 289,014,000 | 1,420,000
Term loan originated in year three | 1,395,000 | 40,505,000
Term loan originated in year four | 34,400,000 | 113,137,000
Term loan originated in year five | 66,100,000 | 85,987,000
Term loan originated prior to year five | 86,705,000 | 56,111,000
Revolving Loans | 0 | 0
Total loans | 823,809,000 | 579,626,000
Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 2,837,000 | 19,203,000
Term loan originated in year two | 1,047,000 | 5,347,000
Term loan originated in year three | 3,816,000 | 1,783,000
Term loan originated in year four | 1,355,000 | 1,699,000
Term loan originated in year five | 1,185,000 | 1,769,000
Term loan originated prior to year five | 7,399,000 | 6,616,000
Revolving Loans | 20,425,000 | 22,095,000
Total loans | 38,064,000 | 58,512,000
Pass / not rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 4,367,851,000 | 4,550,798,000
Term loan originated in year two | 3,763,733,000 | 1,931,920,000
Term loan originated in year three | 1,734,124,000 | 1,799,957,000
Term loan originated in year four | 1,487,099,000 | 1,489,539,000
Term loan originated in year five | 1,193,158,000 | 1,035,913,000
Term loan originated prior to year five | 1,473,570,000 | 1,229,565,000
Revolving Loans | 1,187,540,000 | 1,415,460,000
Total loans | 15,207,075,000 | 13,453,152,000
Pass / not rated | Commercial business |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 1,920,005,000 | 1,755,104,000
Term loan originated in year two | 1,214,335,000 | 431,145,000
Term loan originated in year three | 327,471,000 | 461,460,000
Term loan originated in year four | 351,613,000 | 98,812,000
Term loan originated in year five | 74,395,000 | 53,629,000
Term loan originated prior to year five | 103,832,000 | 70,294,000
Revolving Loans | 1,069,033,000 | 1,299,372,000
Total loans | 5,060,684,000 | 4,169,816,000
Pass / not rated | Residential Portfolio Segment |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 346,195,000 | 282,191,000
Term loan originated in year two | 289,014,000 | 1,420,000
Term loan originated in year three | 1,395,000 | 40,377,000
Term loan originated in year four | 34,293,000 | 112,743,000
Term loan originated in year five | 65,713,000 | 85,446,000
Term loan originated prior to year five | 78,468,000 | 53,979,000
Revolving Loans | 0 | 0
Total loans | 815,078,000 | 576,156,000
Pass / not rated | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 2,837,000 | 19,203,000
Term loan originated in year two | 1,047,000 | 5,347,000
Term loan originated in year three | 3,816,000 | 1,783,000
Term loan originated in year four | 1,355,000 | 1,699,000
Term loan originated in year five | 1,185,000 | 1,769,000
Term loan originated prior to year five | 7,026,000 | 6,165,000
Revolving Loans | 20,425,000 | 22,095,000
Total loans | 37,691,000 | 58,061,000
Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 6,932,000
Term loan originated in year two | 32,030,000 | 9,405,000
Term loan originated in year three | 15,335,000 | 44,347,000
Term loan originated in year four | 119,000 | 69,630,000
Term loan originated in year five | 6,628,000 | 32,828,000
Term loan originated prior to year five | 20,500,000 | 85,488,000
Revolving Loans | 4,787,000 | 8,564,000
Total loans | 79,399,000 | 257,194,000
Special mention | Commercial business |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 1,379,000
Term loan originated in year two | 20,390,000 | 523,000
Term loan originated in year three | 13,621,000 | 4,780,000
Term loan originated in year four | 119,000 | 2,897,000
Term loan originated in year five | 2,099,000 | 550,000
Term loan originated prior to year five | 485,000 | 5,083,000
Revolving Loans | 4,585,000 | 2,594,000
Total loans | 41,299,000 | 17,806,000
Special mention | Residential Portfolio Segment |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 0
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 0
Term loan originated in year four | 0 | 0
Term loan originated in year five | 0 | 0
Term loan originated prior to year five | 0 | 0
Revolving Loans | 0 | 0
Total loans | 0 | 0
Special mention | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 0
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 0
Term loan originated in year four | 0 | 0
Term loan originated in year five | 0 | 0
Term loan originated prior to year five | 0 | 0
Revolving Loans | 0 | 0
Total loans | 0 | 0
Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 46,950,000 | 11,507,000
Term loan originated in year two | 11,930,000 | 8,659,000
Term loan originated in year three | 9,061,000 | 19,969,000
Term loan originated in year four | 21,377,000 | 27,508,000
Term loan originated in year five | 23,939,000 | 57,344,000
Term loan originated prior to year five | 87,234,000 | 112,039,000
Revolving Loans | 4,222,000 | 5,371,000
Total loans | 204,713,000 | 242,397,000
Substandard | Commercial business |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 252,000 | 3,796,000
Term loan originated in year two | 3,214,000 | 941,000
Term loan originated in year three | 6,324,000 | 2,308,000
Term loan originated in year four | 2,229,000 | 1,651,000
Term loan originated in year five | 1,206,000 | 3,803,000
Term loan originated prior to year five | 5,268,000 | 3,461,000
Revolving Loans | 3,945,000 | 5,092,000
Total loans | 22,438,000 | 21,052,000
Substandard | Residential Portfolio Segment |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 275,000
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 128,000
Term loan originated in year four | 107,000 | 394,000
Term loan originated in year five | 387,000 | 541,000
Term loan originated prior to year five | 8,237,000 | 2,132,000
Revolving Loans | 0 | 0
Total loans | 8,731,000 | 3,470,000
Substandard | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 0
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 0
Term loan originated in year four | 0 | 0
Term loan originated in year five | 0 | 0
Term loan originated prior to year five | 373,000 | 451,000
Revolving Loans | 0 | 0
Total loans | 373,000 | 451,000
Doubtful / loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 0
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 0
Term loan originated in year four | 0 | 0
Term loan originated in year five | 0 | 0
Term loan originated prior to year five | 0 | 0
Revolving Loans | 0 | 0
Total loans | 0 | 0
Doubtful / loss | Commercial business |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 0
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 0
Term loan originated in year four | 0 | 0
Term loan originated in year five | 0 | 0
Term loan originated prior to year five | 0 | 0
Revolving Loans | 0 | 0
Total loans | 0 | 0
Doubtful / loss | Residential Portfolio Segment |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 0
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 0
Term loan originated in year four | 0 | 0
Term loan originated in year five | 0 | 0
Term loan originated prior to year five | 0 | 0
Revolving Loans | 0 | 0
Total loans | 0 | 0
Doubtful / loss | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 0
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 0
Term loan originated in year four | 0 | 0
Term loan originated in year five | 0 | 0
Term loan originated prior to year five | 0 | 0
Revolving Loans | 0 | 0
Total loans | 0 | 0
Residential | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 14,306,000 | 26,093,000
Term loan originated in year two | 25,324,000 | 10,471,000
Term loan originated in year three | 9,743,000 | 11,442,000
Term loan originated in year four | 9,085,000 | 5,619,000
Term loan originated in year five | 4,652,000 | 2,987,000
Term loan originated prior to year five | 7,708,000 | 8,184,000
Revolving Loans | 4,670,000 | 4,403,000
Total loans | 75,488,000 | 69,199,000
Residential | Pass / not rated | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 14,306,000 | 26,093,000
Term loan originated in year two | 25,324,000 | 10,471,000
Term loan originated in year three | 9,743,000 | 11,442,000
Term loan originated in year four | 9,085,000 | 4,952,000
Term loan originated in year five | 3,990,000 | 2,987,000
Term loan originated prior to year five | 7,146,000 | 7,260,000
Revolving Loans | 4,670,000 | 4,403,000
Total loans | 74,264,000 | 67,608,000
Residential | Special mention | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 0
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 0
Term loan originated in year four | 0 | 534,000
Term loan originated in year five | 0 | 0
Term loan originated prior to year five | 0 | 924,000
Revolving Loans | 0 | 0
Total loans | 0 | 1,458,000
Residential | Substandard | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 0
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 0
Term loan originated in year four | 0 | 133,000
Term loan originated in year five | 662,000 | 0
Term loan originated prior to year five | 562,000 | 0
Revolving Loans | 0 | 0
Total loans | 1,224,000 | 133,000
Residential | Doubtful / loss | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 0
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 0
Term loan originated in year four | 0 | 0
Term loan originated in year five | 0 | 0
Term loan originated prior to year five | 0 | 0
Revolving Loans | 0 | 0
Total loans | 0 | 0
Commercial | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 2,084,090,000 | 2,464,651,000
Term loan originated in year two | 2,215,405,000 | 1,432,509,000
Term loan originated in year three | 1,333,336,000 | 1,309,951,000
Term loan originated in year four | 1,074,370,000 | 1,283,958,000
Term loan originated in year five | 1,066,035,000 | 963,994,000
Term loan originated prior to year five | 1,349,156,000 | 1,265,267,000
Revolving Loans | 93,802,000 | 95,750,000
Total loans | 9,216,194,000 | 8,816,080,000
Commercial | Pass / not rated | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 2,083,073,000 | 2,451,662,000
Term loan originated in year two | 2,195,049,000 | 1,415,909,000
Term loan originated in year three | 1,328,885,000 | 1,252,851,000
Term loan originated in year four | 1,055,329,000 | 1,238,425,000
Term loan originated in year five | 1,039,822,000 | 883,790,000
Term loan originated prior to year five | 1,272,491,000 | 1,086,182,000
Revolving Loans | 93,323,000 | 89,501,000
Total loans | 9,067,972,000 | 8,418,320,000
Commercial | Special mention | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 5,553,000
Term loan originated in year two | 11,640,000 | 8,882,000
Term loan originated in year three | 1,714,000 | 39,567,000
Term loan originated in year four | 0 | 20,203,000
Term loan originated in year five | 4,529,000 | 27,204,000
Term loan originated prior to year five | 3,871,000 | 73,090,000
Revolving Loans | 202,000 | 5,970,000
Total loans | 21,956,000 | 180,469,000
Commercial | Substandard | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 1,017,000 | 7,436,000
Term loan originated in year two | 8,716,000 | 7,718,000
Term loan originated in year three | 2,737,000 | 17,533,000
Term loan originated in year four | 19,041,000 | 25,330,000
Term loan originated in year five | 21,684,000 | 53,000,000
Term loan originated prior to year five | 72,794,000 | 105,995,000
Revolving Loans | 277,000 | 279,000
Total loans | 126,266,000 | 217,291,000
Commercial | Doubtful / loss | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 0
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 0
Term loan originated in year four | 0 | 0
Term loan originated in year five | 0 | 0
Term loan originated prior to year five | 0 | 0
Revolving Loans | 0 | 0
Total loans | 0 | 0
Construction | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 47,116,000 | 16,545,000
Term loan originated in year two | 38,964,000 | 67,628,000
Term loan originated in year three | 62,814,000 | 32,044,000
Term loan originated in year four | 35,424,000 | 78,904,000
Term loan originated in year five | 8,053,000 | 13,366,000
Term loan originated prior to year five | 20,751,000 | 12,076,000
Revolving Loans | 89,000 | 89,000
Total loans | 213,211,000 | 220,652,000
Construction | Pass / not rated | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 1,435,000 | 16,545,000
Term loan originated in year two | 38,964,000 | 67,628,000
Term loan originated in year three | 62,814,000 | 32,044,000
Term loan originated in year four | 35,424,000 | 32,908,000
Term loan originated in year five | 8,053,000 | 8,292,000
Term loan originated prior to year five | 4,607,000 | 5,685,000
Revolving Loans | 89,000 | 89,000
Total loans | 151,386,000 | 163,191,000
Construction | Special mention | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 0
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 0
Term loan originated in year four | 0 | 45,996,000
Term loan originated in year five | 0 | 5,074,000
Term loan originated prior to year five | 16,144,000 | 6,391,000
Revolving Loans | 0 | 0
Total loans | 16,144,000 | 57,461,000
Construction | Substandard | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 45,681,000 | 0
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 0
Term loan originated in year four | 0 | 0
Term loan originated in year five | 0 | 0
Term loan originated prior to year five | 0 | 0
Revolving Loans | 0 | 0
Total loans | 45,681,000 | 0
Construction | Doubtful / loss | Real estate loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Term loan originated in year one | 0 | 0
Term loan originated in year two | 0 | 0
Term loan originated in year three | 0 | 0
Term loan originated in year four | 0 | 0
Term loan originated in year five | 0 | 0
Term loan originated prior to year five | 0 | 0
Revolving Loans | 0 | 0
Total loans | $ 0 | $ 0

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