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Loans Receivable and Allowance for Credit Losses - Financing Receivable Credit Quality Indicators (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	$ 2,109,455,000	$ 2,916,458,000
Term loan originated in year two	2,439,800,000	2,338,244,000
Term loan originated in year three	2,046,141,000	2,179,365,000
Term loan originated in year four	1,853,956,000	1,673,297,000
Term loan originated in year five	1,435,777,000	995,558,000
Term loan originated prior to year five	2,075,980,000	1,591,756,000
Revolving Loans	1,463,192,000	1,868,535,000
Total loans	13,424,301,000	13,563,213,000
Revolving loans converted to term loans	0	0
Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	8,832,276,000	8,772,134,000
Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	892,382,000	1,302,794,000
Term loan originated in year two	875,899,000	613,469,000
Term loan originated in year three	522,592,000	260,839,000
Term loan originated in year four	163,056,000	136,731,000
Term loan originated in year five	125,376,000	89,755,000
Term loan originated prior to year five	113,714,000	52,276,000
Revolving Loans	1,308,404,000	1,701,923,000
Total loans	4,001,423,000	4,157,787,000
Residential Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	116,677,000	5,733,000
Term loan originated in year two	4,764,000	91,080,000
Term loan originated in year three	57,068,000	217,879,000
Term loan originated in year four	166,977,000	169,388,000
Term loan originated in year five	124,136,000	56,961,000
Term loan originated prior to year five	74,000,000	41,191,000
Revolving Loans	0	0
Total loans	543,622,000	582,232,000
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	2,784,000	8,309,000
Term loan originated in year two	5,994,000	2,463,000
Term loan originated in year three	2,243,000	1,818,000
Term loan originated in year four	1,937,000	2,424,000
Term loan originated in year five	2,114,000	4,811,000
Term loan originated prior to year five	7,854,000	3,343,000
Revolving Loans	24,054,000	27,892,000
Total loans	46,980,000	51,060,000
Pass / not rated
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	2,096,076,000	2,907,906,000
Term loan originated in year two	2,424,575,000	2,292,068,000
Term loan originated in year three	1,974,267,000	2,088,791,000
Term loan originated in year four	1,735,996,000	1,595,141,000
Term loan originated in year five	1,324,546,000	917,069,000
Term loan originated prior to year five	1,755,466,000	1,362,723,000
Revolving Loans	1,437,861,000	1,848,017,000
Total loans	12,748,787,000	13,011,715,000
Pass / not rated | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	889,734,000	1,294,368,000
Term loan originated in year two	866,932,000	584,453,000
Term loan originated in year three	516,793,000	224,447,000
Term loan originated in year four	147,361,000	117,708,000
Term loan originated in year five	112,324,000	77,209,000
Term loan originated prior to year five	100,388,000	43,674,000
Revolving Loans	1,297,976,000	1,686,428,000
Total loans	3,931,508,000	4,028,287,000
Pass / not rated | Residential Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	116,677,000	5,733,000
Term loan originated in year two	4,764,000	90,958,000
Term loan originated in year three	56,940,000	217,343,000
Term loan originated in year four	166,777,000	168,827,000
Term loan originated in year five	123,595,000	55,246,000
Term loan originated prior to year five	71,816,000	40,554,000
Revolving Loans	0	0
Total loans	540,569,000	578,661,000
Pass / not rated | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	2,784,000	8,309,000
Term loan originated in year two	5,994,000	2,463,000
Term loan originated in year three	2,243,000	1,818,000
Term loan originated in year four	1,937,000	2,321,000
Term loan originated in year five	2,114,000	4,756,000
Term loan originated prior to year five	7,611,000	2,811,000
Revolving Loans	24,054,000	27,890,000
Total loans	46,737,000	50,368,000
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	5,414,000	5,996,000
Term loan originated in year two	6,121,000	30,498,000
Term loan originated in year three	52,495,000	55,421,000
Term loan originated in year four	88,785,000	25,426,000
Term loan originated in year five	45,353,000	20,190,000
Term loan originated prior to year five	82,523,000	40,411,000
Revolving Loans	13,868,000	6,999,000
Total loans	294,559,000	184,941,000
Special mention | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	1,191,000	5,996,000
Term loan originated in year two	415,000	27,693,000
Term loan originated in year three	3,943,000	30,852,000
Term loan originated in year four	13,581,000	14,629,000
Term loan originated in year five	212,000	6,388,000
Term loan originated prior to year five	5,466,000	3,139,000
Revolving Loans	1,662,000	5,172,000
Total loans	26,470,000	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	0	0
Term loan originated prior to year five	0	0
Revolving Loans	0	0
Total loans	0	103,000
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	7,965,000	2,556,000
Term loan originated in year two	9,104,000	15,678,000
Term loan originated in year three	19,379,000	35,152,000
Term loan originated in year four	29,175,000	52,730,000
Term loan originated in year five	65,878,000	58,299,000
Term loan originated prior to year five	237,991,000	188,622,000
Revolving Loans	11,463,000	13,519,000
Total loans	380,955,000	366,556,000
Substandard | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	1,457,000	2,430,000
Term loan originated in year two	8,552,000	1,323,000
Term loan originated in year three	1,856,000	5,539,000
Term loan originated in year four	2,114,000	4,394,000
Term loan originated in year five	12,840,000	6,158,000
Term loan originated prior to year five	7,860,000	5,463,000
Revolving Loans	8,766,000	10,323,000
Total loans	43,445,000	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	128,000	536,000
Term loan originated in year four	200,000	561,000
Term loan originated in year five	541,000	1,715,000
Term loan originated prior to year five	2,184,000	637,000
Revolving Loans	0	0
Total loans	3,053,000	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	243,000	532,000
Revolving Loans	0	2,000
Total loans	243,000	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	12,995,000	15,158,000
Term loan originated in year two	14,311,000	13,924,000
Term loan originated in year three	13,556,000	7,726,000
Term loan originated in year four	5,683,000	4,316,000
Term loan originated in year five	3,831,000	6,800,000
Term loan originated prior to year five	10,098,000	3,540,000
Revolving Loans	886,000	3,331,000
Total loans	61,360,000	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	12,995,000	15,158,000
Term loan originated in year two	14,311,000	13,924,000
Term loan originated in year three	13,556,000	7,587,000
Term loan originated in year four	5,547,000	4,316,000
Term loan originated in year five	3,831,000	6,800,000
Term loan originated prior to year five	10,098,000	3,460,000
Revolving Loans	658,000	3,104,000
Total loans	60,996,000	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	136,000	0
Term loan originated in year five	0	0
Term loan originated prior to year five	0	80,000
Revolving Loans	0	0
Total loans	136,000	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	1,083,776,000	1,548,721,000
Term loan originated in year two	1,491,807,000	1,572,018,000
Term loan originated in year three	1,406,108,000	1,587,309,000
Term loan originated in year four	1,431,016,000	1,288,841,000
Term loan originated in year five	1,148,240,000	825,720,000
Term loan originated prior to year five	1,835,777,000	1,467,961,000
Revolving Loans	121,391,000	135,389,000
Total loans	8,518,115,000	8,425,959,000
Commercial | Pass / not rated | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	1,073,045,000	1,548,595,000
Term loan originated in year two	1,485,549,000	1,554,980,000
Term loan originated in year three	1,340,161,000	1,533,802,000
Term loan originated in year four	1,375,076,000	1,240,973,000
Term loan originated in year five	1,055,030,000	767,318,000
Term loan originated prior to year five	1,544,353,000	1,262,125,000
Revolving Loans	106,716,000	130,595,000
Total loans	7,979,930,000	8,038,388,000
Commercial | Special mention | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	4,223,000	0
Term loan originated in year two	5,706,000	2,805,000
Term loan originated in year three	48,552,000	24,569,000
Term loan originated in year four	29,215,000	10,694,000
Term loan originated in year five	40,713,000	8,031,000
Term loan originated prior to year five	71,144,000	32,048,000
Revolving Loans	11,978,000	1,600,000
Total loans	211,531,000	79,747,000
Commercial | Substandard | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	6,508,000	126,000
Term loan originated in year two	552,000	14,233,000
Term loan originated in year three	17,395,000	28,938,000
Term loan originated in year four	26,725,000	37,174,000
Term loan originated in year five	52,497,000	50,371,000
Term loan originated prior to year five	220,280,000	173,788,000
Revolving Loans	2,697,000	3,194,000
Total loans	326,654,000	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	841,000	35,743,000
Term loan originated in year two	47,025,000	45,290,000
Term loan originated in year three	44,574,000	103,794,000
Term loan originated in year four	85,287,000	71,597,000
Term loan originated in year five	32,080,000	11,511,000
Term loan originated prior to year five	34,537,000	23,445,000
Revolving Loans	8,457,000	0
Total loans	252,801,000	291,380,000
Construction | Pass / not rated | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	841,000	35,743,000
Term loan originated in year two	47,025,000	45,290,000
Term loan originated in year three	44,574,000	103,794,000
Term loan originated in year four	39,298,000	60,996,000
Term loan originated in year five	27,652,000	5,740,000
Term loan originated prior to year five	21,200,000	10,099,000
Revolving Loans	8,457,000	0
Total loans	189,047,000	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	45,989,000	0
Term loan originated in year five	4,428,000	5,771,000
Term loan originated prior to year five	5,913,000	5,224,000
Revolving Loans	0	0
Total loans	56,330,000	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	0	0
Term loan originated prior to year five	7,424,000	8,122,000
Revolving Loans	0	0
Total loans	7,424,000	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

X

- Definition

Amount, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

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

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

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Amount excluding accrued interest of revolving financing receivable converted to term loan.

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Amount excluding accrued interest of financing receivable originated four years prior to current fiscal year.

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

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Amount excluding accrued interest of financing receivable originated in current fiscal year.

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