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Loans Receivable and Allowance for Credit Losses - Financing Receivable Credit Quality Indicators (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving loans converted to term loans $ 0   $ 0
Term loan originated in year one 964,368,000 $ 2,916,458,000  
Term loan originated in year two 2,704,864,000 2,338,244,000  
Term loan originated in year three 2,232,356,000 2,179,365,000  
Term loan originated in year four 2,069,053,000 1,673,297,000  
Term loan originated in year five 1,574,930,000 995,558,000  
Term loan originated prior to year five 2,392,654,000 1,591,756,000  
Revolving Loans 1,764,404,000 1,868,535,000  
Total loans 13,702,629,000 13,563,213,000  
Real estate loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 8,811,423,000 8,772,134,000  
Commercial business      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 541,048,000 1,302,794,000  
Term loan originated in year two 1,120,275,000 613,469,000  
Term loan originated in year three 569,280,000 260,839,000  
Term loan originated in year four 246,433,000 136,731,000  
Term loan originated in year five 124,108,000 89,755,000  
Term loan originated prior to year five 128,835,000 52,276,000  
Revolving Loans 1,616,265,000 1,701,923,000  
Total loans 4,346,244,000 4,157,787,000  
Residential Portfolio Segment      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 5,000 5,733,000  
Term loan originated in year two 5,635,000 91,080,000  
Term loan originated in year three 70,611,000 217,879,000  
Term loan originated in year four 198,415,000 169,388,000  
Term loan originated in year five 146,475,000 56,961,000  
Term loan originated prior to year five 79,859,000 41,191,000  
Revolving Loans 0 0  
Total loans 501,000,000 582,232,000  
Consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 1,597,000 8,309,000  
Term loan originated in year two 6,340,000 2,463,000  
Term loan originated in year three 2,392,000 1,818,000  
Term loan originated in year four 1,873,000 2,424,000  
Term loan originated in year five 2,208,000 4,811,000  
Term loan originated prior to year five 7,770,000 3,343,000  
Revolving Loans 21,782,000 27,892,000  
Total loans 43,962,000 51,060,000  
Pass/Not Rated      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 954,811,000 2,907,906,000  
Term loan originated in year two 2,693,530,000 2,292,068,000  
Term loan originated in year three 2,166,673,000 2,088,791,000  
Term loan originated in year four 1,958,619,000 1,595,141,000  
Term loan originated in year five 1,455,312,000 917,069,000  
Term loan originated prior to year five 2,074,787,000 1,362,723,000  
Revolving Loans 1,738,875,000 1,848,017,000  
Total loans 13,042,607,000 13,011,715,000  
Pass/Not Rated | Commercial business      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 535,629,000 1,294,368,000  
Term loan originated in year two 1,109,519,000 584,453,000  
Term loan originated in year three 563,787,000 224,447,000  
Term loan originated in year four 230,107,000 117,708,000  
Term loan originated in year five 107,590,000 77,209,000  
Term loan originated prior to year five 107,798,000 43,674,000  
Revolving Loans 1,603,017,000 1,686,428,000  
Total loans 4,257,447,000 4,028,287,000  
Pass/Not Rated | Residential Portfolio Segment      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 5,000 5,733,000  
Term loan originated in year two 5,635,000 90,958,000  
Term loan originated in year three 70,489,000 217,343,000  
Term loan originated in year four 197,903,000 168,827,000  
Term loan originated in year five 145,923,000 55,246,000  
Term loan originated prior to year five 77,666,000 40,554,000  
Revolving Loans 0 0  
Total loans 497,621,000 578,661,000  
Pass/Not Rated | Consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 1,597,000 8,309,000  
Term loan originated in year two 6,340,000 2,463,000  
Term loan originated in year three 2,392,000 1,818,000  
Term loan originated in year four 1,873,000 2,321,000  
Term loan originated in year five 2,118,000 4,756,000  
Term loan originated prior to year five 7,187,000 2,811,000  
Revolving Loans 21,782,000 27,890,000  
Total loans 43,289,000 50,368,000  
Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 5,658,000 5,996,000  
Term loan originated in year two 1,337,000 30,498,000  
Term loan originated in year three 48,375,000 55,421,000  
Term loan originated in year four 77,497,000 25,426,000  
Term loan originated in year five 38,440,000 20,190,000  
Term loan originated prior to year five 97,388,000 40,411,000  
Revolving Loans 12,279,000 6,999,000  
Total loans 280,974,000 184,941,000  
Special mention | Commercial business      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 5,136,000 5,996,000  
Term loan originated in year two 1,337,000 27,693,000  
Term loan originated in year three 3,977,000 30,852,000  
Term loan originated in year four 13,448,000 14,629,000  
Term loan originated in year five 5,942,000 6,388,000  
Term loan originated prior to year five 11,226,000 3,139,000  
Revolving Loans 3,196,000 5,172,000  
Total loans 44,262,000 93,869,000  
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 0 103,000  
Term loan originated in year five 90,000 0  
Term loan originated prior to year five 0 0  
Revolving Loans 0 0  
Total loans 90,000 103,000  
Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 3,899,000 2,556,000  
Term loan originated in year two 9,997,000 15,678,000  
Term loan originated in year three 17,308,000 35,152,000  
Term loan originated in year four 32,937,000 52,730,000  
Term loan originated in year five 81,178,000 58,299,000  
Term loan originated prior to year five 220,479,000 188,622,000  
Revolving Loans 13,250,000 13,519,000  
Total loans 379,048,000 366,556,000  
Substandard | Commercial business      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 283,000 2,430,000  
Term loan originated in year two 9,419,000 1,323,000  
Term loan originated in year three 1,516,000 5,539,000  
Term loan originated in year four 2,878,000 4,394,000  
Term loan originated in year five 10,576,000 6,158,000  
Term loan originated prior to year five 9,811,000 5,463,000  
Revolving Loans 10,052,000 10,323,000  
Total loans 44,535,000 35,630,000  
Substandard | Residential Portfolio Segment      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 0 0  
Term loan originated in year two 0 122,000  
Term loan originated in year three 122,000 536,000  
Term loan originated in year four 512,000 561,000  
Term loan originated in year five 552,000 1,715,000  
Term loan originated prior to year five 2,193,000 637,000  
Revolving Loans 0 0  
Total loans 3,379,000 3,571,000  
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 55,000  
Term loan originated prior to year five 583,000 532,000  
Revolving Loans 0 2,000  
Total loans 583,000 589,000  
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 1,000  
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 1,000  
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 1,000  
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 1,000  
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 Mortgage [Member] | Real estate loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 1,517,000 15,158,000  
Term loan originated in year two 15,081,000 13,924,000  
Term loan originated in year three 13,836,000 7,726,000  
Term loan originated in year four 6,993,000 4,316,000  
Term loan originated in year five 4,105,000 6,800,000  
Term loan originated prior to year five 10,249,000 3,540,000  
Revolving Loans 890,000 3,331,000  
Total loans 52,671,000 54,795,000  
Residential Mortgage [Member] | Pass/Not Rated | Real estate loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 1,517,000 15,158,000  
Term loan originated in year two 15,081,000 13,924,000  
Term loan originated in year three 13,836,000 7,587,000  
Term loan originated in year four 6,856,000 4,316,000  
Term loan originated in year five 4,105,000 6,800,000  
Term loan originated prior to year five 10,174,000 3,460,000  
Revolving Loans 662,000 3,104,000  
Total loans 52,231,000 54,349,000  
Residential Mortgage [Member] | 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 0  
Term loan originated in year five 0 0  
Term loan originated prior to year five 0 0  
Revolving Loans 228,000 227,000  
Total loans 228,000 227,000  
Residential Mortgage [Member] | 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 0 139,000  
Term loan originated in year four 137,000 0  
Term loan originated in year five 0 0  
Term loan originated prior to year five 75,000 80,000  
Revolving Loans 0 0  
Total loans 212,000 219,000  
Residential Mortgage [Member] | 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 415,011,000 1,548,721,000  
Term loan originated in year two 1,515,115,000 1,572,018,000  
Term loan originated in year three 1,534,273,000 1,587,309,000  
Term loan originated in year four 1,529,828,000 1,288,841,000  
Term loan originated in year five 1,238,406,000 825,720,000  
Term loan originated prior to year five 2,131,538,000 1,467,961,000  
Revolving Loans 125,467,000 135,389,000  
Total loans 8,489,638,000 8,425,959,000  
Commercial | Pass/Not Rated | Real estate loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 410,873,000 1,548,595,000  
Term loan originated in year two 1,514,537,000 1,554,980,000  
Term loan originated in year three 1,474,205,000 1,533,802,000  
Term loan originated in year four 1,436,369,000 1,240,973,000  
Term loan originated in year five 1,150,644,000 767,318,000  
Term loan originated prior to year five 1,845,078,000 1,262,125,000  
Revolving Loans 113,414,000 130,595,000  
Total loans 7,945,120,000 8,038,388,000  
Commercial | Special mention | Real estate loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 522,000 0  
Term loan originated in year two 0 2,805,000  
Term loan originated in year three 44,398,000 24,569,000  
Term loan originated in year four 64,049,000 10,694,000  
Term loan originated in year five 28,313,000 8,031,000  
Term loan originated prior to year five 86,162,000 32,048,000  
Revolving Loans 8,855,000 1,600,000  
Total loans 232,299,000 79,747,000  
Commercial | Substandard | Real estate loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 3,616,000 126,000  
Term loan originated in year two 578,000 14,233,000  
Term loan originated in year three 15,670,000 28,938,000  
Term loan originated in year four 29,410,000 37,174,000  
Term loan originated in year five 59,449,000 50,371,000  
Term loan originated prior to year five 200,298,000 173,788,000  
Revolving Loans 3,198,000 3,194,000  
Total loans 312,219,000 307,824,000  
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 5,190,000 35,743,000  
Term loan originated in year two 42,418,000 45,290,000  
Term loan originated in year three 41,964,000 103,794,000  
Term loan originated in year four 85,511,000 71,597,000  
Term loan originated in year five 59,628,000 11,511,000  
Term loan originated prior to year five 34,403,000 23,445,000  
Revolving Loans 0 0  
Total loans 269,114,000 291,380,000  
Construction | Pass/Not Rated | Real estate loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Term loan originated in year one 5,190,000 35,743,000  
Term loan originated in year two 42,418,000 45,290,000  
Term loan originated in year three 41,964,000 103,794,000  
Term loan originated in year four 85,511,000 60,996,000  
Term loan originated in year five 44,932,000 5,740,000  
Term loan originated prior to year five 26,884,000 10,099,000  
Revolving Loans 0 0  
Total loans 246,899,000 261,662,000  
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 0  
Term loan originated in year five 4,095,000 5,771,000  
Term loan originated prior to year five 0 5,224,000  
Revolving Loans 0 0  
Total loans 4,095,000 10,995,000  
Construction | 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 10,601,000  
Term loan originated in year five 10,601,000 0  
Term loan originated prior to year five 7,519,000 8,122,000  
Revolving Loans 0 0  
Total loans 18,120,000 18,723,000  
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