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Loans Receivable - Credit Quality Indicators (Details) - USD ($)
 3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Credit quality indicators    
Total loans receivable $ 8,836,874,000 $ 8,808,674,000
YTD March 31, 2020 432,572,000  
2019 1,700,079,000  
2018 1,118,154,000  
2017 972,987,000  
2016 697,742,000  
Prior 2,731,873,000  
Revolving Loans 1,104,776,000  
Revolving loans converted to term loans 78,688,000  
Total loans receivable, gross 8,836,874,000 8,808,674,000
Revolving loans converted to term loans during the period 4,700,000  
Personal Banking    
Credit quality indicators    
Total loans receivable 5,382,126,000 5,336,177,000
YTD March 31, 2020 338,694,000  
2019 1,223,862,000  
2018 677,189,000  
2017 492,505,000  
2016 371,039,000  
Prior 1,710,679,000  
Revolving Loans 527,152,000  
Revolving loans converted to term loans 41,005,000  
Total loans receivable, gross 5,382,126,000 5,336,177,000
Personal Banking | Residential mortgage loans    
Credit quality indicators    
Total loans receivable 2,834,733,000 2,868,127,000
Total loans receivable, gross 2,834,733,000 2,868,127,000
Personal Banking | Residential mortgage loans | Pass    
Credit quality indicators    
Total loans receivable, gross 2,815,671,000  
Personal Banking | Residential mortgage loans | Substandard    
Credit quality indicators    
Total loans receivable, gross 19,062,000  
Personal Banking | Home equity loans    
Credit quality indicators    
Total loans receivable 1,360,654,000 1,342,918,000
Total loans receivable, gross 1,360,654,000 1,343,427,000
Personal Banking | Home equity loans | Pass    
Credit quality indicators    
YTD March 31, 2020 62,841,000  
2019 221,783,000  
2018 111,767,000  
2017 103,107,000  
2016 97,444,000  
Prior 262,224,000  
Revolving Loans 456,600,000  
Revolving loans converted to term loans 36,305,000  
Total loans receivable, gross 1,352,071,000  
Personal Banking | Home equity loans | Substandard    
Credit quality indicators    
YTD March 31, 2020 0  
2019 25,000  
2018 112,000  
2017 185,000  
2016 764,000  
Prior 4,300,000  
Revolving Loans 1,532,000  
Revolving loans converted to term loans 1,666,000  
Total loans receivable, gross 8,583,000  
Personal Banking | Vehicle loans    
Credit quality indicators    
Total loans receivable, gross 936,827,000  
Personal Banking | Vehicle loans | Pass    
Credit quality indicators    
YTD March 31, 2020 36,919,000  
2019 80,750,000  
2018 246,493,000  
2017 428,865,000  
2016 126,861,000  
Prior 14,147,000  
Revolving loans converted to term loans 0  
Total loans receivable, gross 934,035,000  
Personal Banking | Vehicle loans | Substandard    
Credit quality indicators    
YTD March 31, 2020 318,000  
2019 723,000  
2018 702,000  
2017 783,000  
2016 0  
Prior 266,000  
Revolving loans converted to term loans 0  
Total loans receivable, gross 2,792,000  
Personal Banking | Consumer loans    
Credit quality indicators    
Total loans receivable 249,912,000 1,125,132,000
YTD March 31, 2020 25,967,000  
2019 96,833,000  
2018 29,952,000  
2017 13,948,000  
2016 5,571,000  
Prior 5,587,000  
Revolving Loans 69,020,000  
Revolving loans converted to term loans 3,034,000  
Total loans receivable, gross 249,912,000 263,431,000
Personal Banking | Consumer loans | Pass    
Credit quality indicators    
Total loans receivable, gross 248,951,000  
Personal Banking | Consumer loans | Substandard    
Credit quality indicators    
YTD March 31, 2020 0  
2019 252,000  
2018 61,000  
2017 79,000  
2016 19,000  
Prior 28,000  
Revolving Loans 430,000  
Revolving loans converted to term loans 92,000  
Total loans receivable, gross 961,000  
Commercial Banking    
Credit quality indicators    
Total loans receivable 3,454,748,000 3,472,497,000
YTD March 31, 2020 93,878,000  
2019 476,217,000  
2018 440,965,000  
2017 480,482,000  
2016 326,703,000  
Prior 1,021,194,000  
Revolving Loans 577,624,000  
Revolving loans converted to term loans 37,683,000  
Total loans receivable, gross 3,454,748,000 3,472,497,000
Commercial Banking | Commercial real estate loans    
Credit quality indicators    
Total loans receivable 2,262,998,000 2,754,390,000
Total loans receivable, gross 2,262,998,000 2,228,109,000
Commercial Banking | Commercial real estate loans | Pass    
Credit quality indicators    
Total loans receivable, gross 2,113,142,000  
Commercial Banking | Commercial real estate loans | Special mention    
Credit quality indicators    
YTD March 31, 2020 105,000  
2019 2,063,000  
2018 7,209,000  
2017 35,698,000  
2016 6,297,000  
Prior 8,888,000  
Revolving Loans 4,989,000  
Revolving loans converted to term loans 801,000  
Total loans receivable, gross 66,051,000  
Commercial Banking | Commercial real estate loans | Substandard    
Credit quality indicators    
YTD March 31, 2020 349,000  
2019 336,000  
2018 3,696,000  
2017 11,695,000  
2016 6,629,000  
Prior 52,992,000  
Revolving Loans 4,091,000  
Revolving loans converted to term loans 4,017,000  
Total loans receivable, gross 83,805,000  
Commercial Banking | Commercial real estate loans | Doubtful    
Credit quality indicators    
Total loans receivable, gross 0  
Commercial Banking | Commercial real estate loans | Loss    
Credit quality indicators    
Total loans receivable, gross 0  
Commercial Banking | Commercial real estate loans - owner occupied    
Credit quality indicators    
Total loans receivable 487,760,000  
YTD March 31, 2020 2,615,000  
2019 69,535,000  
2018 98,533,000  
2017 94,686,000  
2016 55,001,000  
Prior 148,336,000  
Revolving Loans 12,300,000  
Revolving loans converted to term loans 6,754,000  
Total loans receivable, gross 487,760,000 526,281,000
Commercial Banking | Commercial real estate loans - owner occupied | Pass    
Credit quality indicators    
YTD March 31, 2020 2,615,000  
2019 65,489,000  
2018 93,389,000  
2017 79,888,000  
2016 45,873,000  
Prior 121,067,000  
Revolving Loans 11,180,000  
Revolving loans converted to term loans 3,440,000  
Total loans receivable, gross 422,940,000  
Commercial Banking | Commercial real estate loans - owner occupied | Special mention    
Credit quality indicators    
YTD March 31, 2020 0  
2019 1,337,000  
2018 1,230,000  
2017 2,682,000  
2016 1,417,000  
Prior 3,535,000  
Revolving Loans 26,000  
Revolving loans converted to term loans 30,000  
Total loans receivable, gross 10,258,000  
Commercial Banking | Commercial real estate loans - owner occupied | Substandard    
Credit quality indicators    
YTD March 31, 2020 0  
2019 2,709,000  
2018 3,914,000  
2017 12,117,000  
2016 7,711,000  
Prior 23,734,000  
Revolving Loans 1,094,000  
Revolving loans converted to term loans 3,284,000  
Total loans receivable, gross 54,562,000  
Commercial Banking | Commercial real estate loans - owner occupied | Doubtful    
Credit quality indicators    
YTD March 31, 2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Revolving loans converted to term loans 0  
Total loans receivable, gross 0  
Commercial Banking | Commercial real estate loans - owner occupied | Loss    
Credit quality indicators    
YTD March 31, 2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Revolving loans converted to term loans 0  
Total loans receivable, gross 0  
Commercial Banking | Commercial loans    
Credit quality indicators    
Total loans receivable 703,990,000 718,107,000
YTD March 31, 2020 18,583,000  
2019 100,711,000  
2018 70,759,000  
2017 61,721,000  
2016 61,446,000  
Prior 43,089,000  
Revolving Loans 327,521,000  
Revolving loans converted to term loans 20,159,000  
Total loans receivable, gross 703,990,000 718,107,000
Commercial Banking | Commercial loans | Pass    
Credit quality indicators    
YTD March 31, 2020 18,210,000  
2019 93,726,000  
2018 61,621,000  
2017 59,597,000  
2016 53,671,000  
Prior 39,638,000  
Revolving Loans 273,335,000  
Revolving loans converted to term loans 9,735,000  
Total loans receivable, gross 609,533,000  
Commercial Banking | Commercial loans | Special mention    
Credit quality indicators    
YTD March 31, 2020 0  
2019 5,811,000  
2018 1,922,000  
2017 551,000  
2016 6,981,000  
Prior 717,000  
Revolving Loans 26,634,000  
Revolving loans converted to term loans 418,000  
Total loans receivable, gross 43,034,000  
Commercial Banking | Commercial loans | Substandard    
Credit quality indicators    
YTD March 31, 2020 373,000  
2019 1,174,000  
2018 7,216,000  
2017 1,573,000  
2016 795,000  
Prior 2,734,000  
Revolving Loans 27,552,000  
Revolving loans converted to term loans 10,006,000  
Total loans receivable, gross 51,423,000  
Commercial Banking | Commercial loans | Doubtful    
Credit quality indicators    
YTD March 31, 2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Revolving loans converted to term loans 0  
Total loans receivable, gross 0  
Commercial Banking | Commercial loans | Loss    
Credit quality indicators    
YTD March 31, 2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Revolving loans converted to term loans 0  
Total loans receivable, gross 0  
Originated    
Credit quality indicators    
Total loans receivable   7,987,057,000
Total loans receivable, gross 8,080,528,000 7,987,057,000
Originated | Personal Banking    
Credit quality indicators    
Total loans receivable 5,382,126,000 4,973,850,000
Total loans receivable, gross 5,060,438,000 4,973,850,000
Originated | Personal Banking | Residential mortgage loans    
Credit quality indicators    
Total loans receivable 2,834,733,000 2,785,189,000
YTD March 31, 2020 123,025,000  
2019 475,573,000  
2018 288,163,000  
2017 293,792,000  
2016 230,024,000  
Prior 1,424,155,000  
Revolving Loans 0  
Revolving loans converted to term loans 0  
Total loans receivable, gross 2,758,695,000 2,785,189,000
Originated | Personal Banking | Residential mortgage loans | Pass    
Credit quality indicators    
YTD March 31, 2020 123,025,000  
2019 475,573,000  
2018 288,056,000  
2017 293,228,000  
2016 229,808,000  
Prior 1,405,981,000  
Revolving Loans 0  
Revolving loans converted to term loans 0  
Originated | Personal Banking | Residential mortgage loans | Substandard    
Credit quality indicators    
YTD March 31, 2020 0  
2019 0  
2018 108,000  
2017 564,000  
2016 216,000  
Prior 18,174,000  
Revolving Loans 0  
Revolving loans converted to term loans 0  
Originated | Personal Banking | Home equity loans    
Credit quality indicators    
Total loans receivable 1,360,654,000 1,100,023,000
YTD March 31, 2020 62,841,000  
2019 221,808,000  
2018 111,879,000  
2017 103,292,000  
2016 98,207,000  
Prior 266,524,000  
Revolving Loans 458,132,000  
Revolving loans converted to term loans 37,971,000  
Total loans receivable, gross 1,129,370,000 1,100,023,000
Originated | Personal Banking | Vehicle loans    
Credit quality indicators    
YTD March 31, 2020 37,237,000  
2019 81,473,000  
2018 247,195,000  
2017 429,648,000  
2016 126,861,000  
Prior 14,413,000  
Revolving loans converted to term loans 0  
Total loans receivable, gross 929,204,000  
Originated | Personal Banking | Consumer loans    
Credit quality indicators    
Total loans receivable 249,912,000 1,088,638,000
Total loans receivable, gross 243,169,000 237,834,000
Originated | Personal Banking | Consumer loans | Pass    
Credit quality indicators    
YTD March 31, 2020 25,967,000  
2019 96,581,000  
2018 29,891,000  
2017 13,869,000  
2016 5,552,000  
Prior 5,559,000  
Revolving Loans 68,590,000  
Revolving loans converted to term loans 2,942,000  
Originated | Commercial Banking    
Credit quality indicators    
Total loans receivable 3,454,748,000 3,013,207,000
Total loans receivable, gross 3,020,090,000 3,013,207,000
Originated | Commercial Banking | Commercial real estate loans    
Credit quality indicators    
Total loans receivable 2,262,998,000 2,349,048,000
Total loans receivable, gross 1,953,458,000 1,915,949,000
Originated | Commercial Banking | Commercial real estate loans - owner occupied    
Credit quality indicators    
Total loans receivable 487,760,000  
Total loans receivable, gross 416,283,000 433,099,000
Originated | Commercial Banking | Commercial loans    
Credit quality indicators    
Total loans receivable 703,990,000 664,159,000
Total loans receivable, gross 650,349,000 664,159,000
Acquired    
Credit quality indicators    
Total loans receivable   821,617,000
Total loans receivable, gross 756,346,000 821,617,000
Acquired | Personal Banking    
Credit quality indicators    
Total loans receivable   362,327,000
Total loans receivable, gross 321,688,000 362,327,000
Acquired | Personal Banking | Residential mortgage loans    
Credit quality indicators    
Total loans receivable   82,938,000
Total loans receivable, gross 76,038,000 82,938,000
Acquired | Personal Banking | Home equity loans    
Credit quality indicators    
Total loans receivable   243,404,000
Total loans receivable, gross 231,284,000 243,404,000
Acquired | Personal Banking | Consumer loans    
Credit quality indicators    
Total loans receivable   35,985,000
Total loans receivable, gross 6,743,000 25,597,000
Acquired | Commercial Banking    
Credit quality indicators    
Total loans receivable   459,290,000
Total loans receivable, gross 434,658,000 459,290,000
Acquired | Commercial Banking | Commercial real estate loans    
Credit quality indicators    
Total loans receivable   405,342,000
YTD March 31, 2020 72,680,000  
2019 305,971,000  
2018 271,674,000  
2017 324,074,000  
2016 210,256,000  
Prior 829,769,000  
Revolving Loans 237,803,000  
Revolving loans converted to term loans 10,770,000  
Total loans receivable, gross 309,540,000 312,160,000
Acquired | Commercial Banking | Commercial real estate loans | Pass    
Credit quality indicators    
YTD March 31, 2020 72,226,000  
2019 303,571,000  
2018 260,769,000  
2017 276,681,000  
2016 197,330,000  
Prior 767,889,000  
Revolving Loans 228,723,000  
Revolving loans converted to term loans 5,952,000  
Acquired | Commercial Banking | Commercial real estate loans | Doubtful    
Credit quality indicators    
YTD March 31, 2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Revolving loans converted to term loans 0  
Acquired | Commercial Banking | Commercial real estate loans | Loss    
Credit quality indicators    
YTD March 31, 2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Revolving loans converted to term loans 0  
Acquired | Commercial Banking | Commercial real estate loans - owner occupied    
Credit quality indicators    
Total loans receivable, gross 71,477,000 93,182,000
Acquired | Commercial Banking | Commercial loans    
Credit quality indicators    
Total loans receivable   53,948,000
Total loans receivable, gross 53,641,000 53,948,000
Minimum | Special Mention And Substandard    
Credit quality indicators    
Total loans receivable $ 1,000,000.0  
Previously Reported    
Credit quality indicators    
Total loans receivable, gross   8,808,674,000
Previously Reported | Pass    
Credit quality indicators    
Total loans receivable, gross   8,471,224,000
Previously Reported | Special mention    
Credit quality indicators    
Total loans receivable, gross   122,950,000
Previously Reported | Substandard    
Credit quality indicators    
Total loans receivable, gross   214,500,000
Previously Reported | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated    
Credit quality indicators    
Total loans receivable, gross   7,987,057,000
Previously Reported | Originated | Pass    
Credit quality indicators    
Total loans receivable, gross   7,715,665,000
Previously Reported | Originated | Special mention    
Credit quality indicators    
Total loans receivable, gross   112,679,000
Previously Reported | Originated | Substandard    
Credit quality indicators    
Total loans receivable, gross   158,713,000
Previously Reported | Originated | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Personal Banking    
Credit quality indicators    
Total loans receivable, gross   4,973,850,000
Previously Reported | Originated | Personal Banking | Pass    
Credit quality indicators    
Total loans receivable, gross   4,955,831,000
Previously Reported | Originated | Personal Banking | Special mention    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Personal Banking | Substandard    
Credit quality indicators    
Total loans receivable, gross   18,019,000
Previously Reported | Originated | Personal Banking | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Personal Banking | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Personal Banking | Residential mortgage loans    
Credit quality indicators    
Total loans receivable, gross   2,785,189,000
Previously Reported | Originated | Personal Banking | Residential mortgage loans | Pass    
Credit quality indicators    
Total loans receivable, gross   2,776,971,000
Previously Reported | Originated | Personal Banking | Residential mortgage loans | Special mention    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Personal Banking | Residential mortgage loans | Substandard    
Credit quality indicators    
Total loans receivable, gross   8,218,000
Previously Reported | Originated | Personal Banking | Residential mortgage loans | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Personal Banking | Residential mortgage loans | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Personal Banking | Home equity loans    
Credit quality indicators    
Total loans receivable, gross   1,099,514,000
Previously Reported | Originated | Personal Banking | Home equity loans | Pass    
Credit quality indicators    
Total loans receivable, gross   1,093,874,000
Previously Reported | Originated | Personal Banking | Home equity loans | Special mention    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Personal Banking | Home equity loans | Substandard    
Credit quality indicators    
Total loans receivable, gross   5,640,000
Previously Reported | Originated | Personal Banking | Home equity loans | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Personal Banking | Home equity loans | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Personal Banking | Consumer loans    
Credit quality indicators    
Total loans receivable, gross   1,089,147,000
Previously Reported | Originated | Personal Banking | Consumer loans | Pass    
Credit quality indicators    
Total loans receivable, gross   1,084,986,000
Previously Reported | Originated | Personal Banking | Consumer loans | Special mention    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Personal Banking | Consumer loans | Substandard    
Credit quality indicators    
Total loans receivable, gross   4,161,000
Previously Reported | Originated | Personal Banking | Consumer loans | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Personal Banking | Consumer loans | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Commercial Banking    
Credit quality indicators    
Total loans receivable, gross   3,013,207,000
Previously Reported | Originated | Commercial Banking | Pass    
Credit quality indicators    
Total loans receivable, gross   2,759,834,000
Previously Reported | Originated | Commercial Banking | Special mention    
Credit quality indicators    
Total loans receivable, gross   112,679,000
Previously Reported | Originated | Commercial Banking | Substandard    
Credit quality indicators    
Total loans receivable, gross   140,694,000
Previously Reported | Originated | Commercial Banking | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Commercial Banking | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Commercial Banking | Commercial real estate loans    
Credit quality indicators    
Total loans receivable, gross   2,349,048,000
Previously Reported | Originated | Commercial Banking | Commercial real estate loans | Pass    
Credit quality indicators    
Total loans receivable, gross   2,188,823,000
Previously Reported | Originated | Commercial Banking | Commercial real estate loans | Special mention    
Credit quality indicators    
Total loans receivable, gross   70,327,000
Previously Reported | Originated | Commercial Banking | Commercial real estate loans | Substandard    
Credit quality indicators    
Total loans receivable, gross   89,898,000
Previously Reported | Originated | Commercial Banking | Commercial real estate loans | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Commercial Banking | Commercial real estate loans | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Commercial Banking | Commercial loans    
Credit quality indicators    
Total loans receivable, gross   664,159,000
Previously Reported | Originated | Commercial Banking | Commercial loans | Pass    
Credit quality indicators    
Total loans receivable, gross   571,011,000
Previously Reported | Originated | Commercial Banking | Commercial loans | Special mention    
Credit quality indicators    
Total loans receivable, gross   42,352,000
Previously Reported | Originated | Commercial Banking | Commercial loans | Substandard    
Credit quality indicators    
Total loans receivable, gross   50,796,000
Previously Reported | Originated | Commercial Banking | Commercial loans | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Originated | Commercial Banking | Commercial loans | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired    
Credit quality indicators    
Total loans receivable, gross   821,617,000
Previously Reported | Acquired | Pass    
Credit quality indicators    
Total loans receivable, gross   755,559,000
Previously Reported | Acquired | Special mention    
Credit quality indicators    
Total loans receivable, gross   10,271,000
Previously Reported | Acquired | Substandard    
Credit quality indicators    
Total loans receivable, gross   55,787,000
Previously Reported | Acquired | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Personal Banking    
Credit quality indicators    
Total loans receivable, gross   362,327,000
Previously Reported | Acquired | Personal Banking | Pass    
Credit quality indicators    
Total loans receivable, gross   359,594,000
Previously Reported | Acquired | Personal Banking | Special mention    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Personal Banking | Substandard    
Credit quality indicators    
Total loans receivable, gross   2,733,000
Previously Reported | Acquired | Personal Banking | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Personal Banking | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Personal Banking | Residential mortgage loans    
Credit quality indicators    
Total loans receivable, gross   82,938,000
Previously Reported | Acquired | Personal Banking | Residential mortgage loans | Pass    
Credit quality indicators    
Total loans receivable, gross   81,611,000
Previously Reported | Acquired | Personal Banking | Residential mortgage loans | Special mention    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Personal Banking | Residential mortgage loans | Substandard    
Credit quality indicators    
Total loans receivable, gross   1,327,000
Previously Reported | Acquired | Personal Banking | Residential mortgage loans | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Personal Banking | Residential mortgage loans | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Personal Banking | Home equity loans    
Credit quality indicators    
Total loans receivable, gross   243,404,000
Previously Reported | Acquired | Personal Banking | Home equity loans | Pass    
Credit quality indicators    
Total loans receivable, gross   242,237,000
Previously Reported | Acquired | Personal Banking | Home equity loans | Special mention    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Personal Banking | Home equity loans | Substandard    
Credit quality indicators    
Total loans receivable, gross   1,167,000
Previously Reported | Acquired | Personal Banking | Home equity loans | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Personal Banking | Home equity loans | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Personal Banking | Consumer loans    
Credit quality indicators    
Total loans receivable, gross   35,985,000
Previously Reported | Acquired | Personal Banking | Consumer loans | Pass    
Credit quality indicators    
Total loans receivable, gross   35,746,000
Previously Reported | Acquired | Personal Banking | Consumer loans | Special mention    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Personal Banking | Consumer loans | Substandard    
Credit quality indicators    
Total loans receivable, gross   239,000
Previously Reported | Acquired | Personal Banking | Consumer loans | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Personal Banking | Consumer loans | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Commercial Banking    
Credit quality indicators    
Total loans receivable, gross   459,290,000
Previously Reported | Acquired | Commercial Banking | Pass    
Credit quality indicators    
Total loans receivable, gross   395,965,000
Previously Reported | Acquired | Commercial Banking | Special mention    
Credit quality indicators    
Total loans receivable, gross   10,271,000
Previously Reported | Acquired | Commercial Banking | Substandard    
Credit quality indicators    
Total loans receivable, gross   53,054,000
Previously Reported | Acquired | Commercial Banking | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Commercial Banking | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Commercial Banking | Commercial real estate loans    
Credit quality indicators    
Total loans receivable, gross   405,342,000
Previously Reported | Acquired | Commercial Banking | Commercial real estate loans | Pass    
Credit quality indicators    
Total loans receivable, gross   349,993,000
Previously Reported | Acquired | Commercial Banking | Commercial real estate loans | Special mention    
Credit quality indicators    
Total loans receivable, gross   10,243,000
Previously Reported | Acquired | Commercial Banking | Commercial real estate loans | Substandard    
Credit quality indicators    
Total loans receivable, gross   45,106,000
Previously Reported | Acquired | Commercial Banking | Commercial real estate loans | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Commercial Banking | Commercial real estate loans | Loss    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Commercial Banking | Commercial loans    
Credit quality indicators    
Total loans receivable, gross   53,948,000
Previously Reported | Acquired | Commercial Banking | Commercial loans | Pass    
Credit quality indicators    
Total loans receivable, gross   45,972,000
Previously Reported | Acquired | Commercial Banking | Commercial loans | Special mention    
Credit quality indicators    
Total loans receivable, gross   28,000
Previously Reported | Acquired | Commercial Banking | Commercial loans | Substandard    
Credit quality indicators    
Total loans receivable, gross   7,948,000
Previously Reported | Acquired | Commercial Banking | Commercial loans | Doubtful    
Credit quality indicators    
Total loans receivable, gross   0
Previously Reported | Acquired | Commercial Banking | Commercial loans | Loss    
Credit quality indicators    
Total loans receivable, gross   $ 0