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Allowance for Credit Losses - Amortized Cost Basis by Year of Origination and Credit Quality Indicator (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Credit quality |  |
2020/2021 |  | $ 2,543,705,000
2019/2020 |  | 2,120,213,000
2018/2019 |  | 1,644,201,000
2017/2018 |  | 1,291,172,000
2016/2017 |  | 882,520,000
Prior |  | 2,236,923,000
Revolving Loans Amortized Cost Basis |  | 2,516,240,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 44,123,000
Total amortized cost basis |  | 13,279,097,000
Loans and leases | $ 12,834,339,000 | 13,279,097,000
Loss |  |
Credit quality |  |
Loans and leases | 0 | 0
Residential mortgage |  |
Credit quality |  |
2020/2021 | 956,022,000 | 864,559,000
2019/2020 | 779,980,000 | 482,495,000
2018/2019 | 392,872,000 | 389,725,000
2017/2018 | 286,382,000 | 471,962,000
2016/2017 | 362,328,000 | 391,156,000
Prior | 1,136,276,000 | 1,089,580,000
Revolving Loans Amortized Cost Basis | 625,000 | 578,000
Revolving Loans Converted to Term Loans Amortized Cost Basis | 147,000 | 163,000
Total amortized cost basis | 3,914,632,000 | 3,690,218,000
Residential mortgage | 740 and greater |  |
Credit quality |  |
2020/2021 | 804,889,000 | 728,807,000
2019/2020 | 661,402,000 | 384,248,000
2018/2019 | 306,706,000 | 290,484,000
2017/2018 | 209,819,000 | 361,297,000
2016/2017 | 270,664,000 | 314,971,000
Prior | 879,063,000 | 830,795,000
Total amortized cost basis | 3,132,543,000 | 2,910,602,000
Residential mortgage | 680 - 739 |  |
Credit quality |  |
2020/2021 | 104,415,000 | 85,151,000
2019/2020 | 79,553,000 | 53,090,000
2018/2019 | 52,470,000 | 44,616,000
2017/2018 | 36,440,000 | 50,703,000
2016/2017 | 40,109,000 | 39,230,000
Prior | 141,178,000 | 144,537,000
Total amortized cost basis | 454,165,000 | 417,327,000
Residential mortgage | 620 - 679 |  |
Credit quality |  |
2020/2021 | 14,479,000 | 15,767,000
2019/2020 | 11,825,000 | 7,604,000
2018/2019 | 6,941,000 | 11,460,000
2017/2018 | 5,683,000 | 9,628,000
2016/2017 | 10,341,000 | 7,982,000
Prior | 41,481,000 | 43,393,000
Total amortized cost basis | 90,750,000 | 95,834,000
Residential mortgage | 550 - 619 |  |
Credit quality |  |
2020/2021 | 231,000 |
2019/2020 | 818,000 | 1,971,000
2018/2019 | 193,000 | 2,818,000
2017/2018 | 2,059,000 | 2,920,000
2016/2017 | 1,428,000 | 4,474,000
Prior | 7,378,000 | 10,144,000
Total amortized cost basis | 12,107,000 | 22,327,000
Residential mortgage | Less than 550 |  |
Credit quality |  |
2019/2020 |  | 861,000
2018/2019 |  | 593,000
2017/2018 | 490,000 | 2,916,000
2016/2017 | 2,533,000 | 594,000
Prior | 3,127,000 | 2,138,000
Total amortized cost basis | 6,150,000 | 7,102,000
Residential mortgage | No Score |  |
Credit quality |  |
2020/2021 | 13,307,000 | 13,823,000
2019/2020 | 8,559,000 | 18,861,000
2018/2019 | 15,727,000 | 21,214,000
2017/2018 | 20,112,000 | 21,821,000
2016/2017 | 18,265,000 | 14,355,000
Prior | 46,312,000 | 45,147,000
Total amortized cost basis | 122,282,000 | 135,221,000
Residential mortgage | Other |  |
Credit quality |  |
2020/2021 | 18,701,000 | 21,011,000
2019/2020 | 17,823,000 | 15,860,000
2018/2019 | 10,835,000 | 18,540,000
2017/2018 | 11,779,000 | 22,677,000
2016/2017 | 18,988,000 | 9,550,000
Prior | 17,737,000 | 13,426,000
Revolving Loans Amortized Cost Basis | 625,000 | 578,000
Revolving Loans Converted to Term Loans Amortized Cost Basis | 147,000 | 163,000
Total amortized cost basis | 96,635,000 | 101,805,000
Home equity |  |
Credit quality |  |
Revolving Loans Amortized Cost Basis |  | 833,521,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 8,103,000
Total amortized cost basis |  | 841,624,000
Home equity | 740 and greater |  |
Credit quality |  |
Revolving Loans Amortized Cost Basis |  | 608,282,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 2,163,000
Total amortized cost basis |  | 610,445,000
Home equity | 680 - 739 |  |
Credit quality |  |
Revolving Loans Amortized Cost Basis |  | 159,886,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 3,155,000
Total amortized cost basis |  | 163,041,000
Home equity | 620 - 679 |  |
Credit quality |  |
Revolving Loans Amortized Cost Basis |  | 44,005,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 1,571,000
Total amortized cost basis |  | 45,576,000
Home equity | 550 - 619 |  |
Credit quality |  |
Revolving Loans Amortized Cost Basis |  | 11,644,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 884,000
Total amortized cost basis |  | 12,528,000
Home equity | Less than 550 |  |
Credit quality |  |
Revolving Loans Amortized Cost Basis |  | 5,159,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 330,000
Total amortized cost basis |  | 5,489,000
Home equity | No Score |  |
Credit quality |  |
Revolving Loans Amortized Cost Basis |  | 4,545,000
Total amortized cost basis |  | 4,545,000
Consumer loans |  |
Credit quality |  |
2020/2021 |  | 250,019,000
2019/2020 |  | 295,128,000
2018/2019 |  | 226,757,000
2017/2018 |  | 139,788,000
2016/2017 |  | 62,534,000
Prior |  | 25,576,000
Revolving Loans Amortized Cost Basis |  | 349,158,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 4,882,000
Total amortized cost basis |  | 1,353,842,000
Consumer loans | 740 and greater |  |
Credit quality |  |
2020/2021 |  | 113,373,000
2019/2020 |  | 122,965,000
2018/2019 |  | 99,678,000
2017/2018 |  | 54,691,000
2016/2017 |  | 24,029,000
Prior |  | 6,034,000
Revolving Loans Amortized Cost Basis |  | 114,748,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 275,000
Total amortized cost basis |  | 535,793,000
Consumer loans | 680 - 739 |  |
Credit quality |  |
2020/2021 |  | 83,316,000
2019/2020 |  | 90,853,000
2018/2019 |  | 66,143,000
2017/2018 |  | 36,426,000
2016/2017 |  | 16,358,000
Prior |  | 4,985,000
Revolving Loans Amortized Cost Basis |  | 76,391,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 773,000
Total amortized cost basis |  | 375,245,000
Consumer loans | 620 - 679 |  |
Credit quality |  |
2020/2021 |  | 40,469,000
2019/2020 |  | 48,904,000
2018/2019 |  | 33,917,000
2017/2018 |  | 24,705,000
2016/2017 |  | 11,144,000
Prior |  | 3,788,000
Revolving Loans Amortized Cost Basis |  | 36,622,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 1,221,000
Total amortized cost basis |  | 200,770,000
Consumer loans | 550 - 619 |  |
Credit quality |  |
2020/2021 |  | 9,125,000
2019/2020 |  | 20,274,000
2018/2019 |  | 17,693,000
2017/2018 |  | 15,126,000
2016/2017 |  | 7,825,000
Prior |  | 2,883,000
Revolving Loans Amortized Cost Basis |  | 12,980,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 1,458,000
Total amortized cost basis |  | 87,364,000
Consumer loans | Less than 550 |  |
Credit quality |  |
2020/2021 |  | 3,017,000
2019/2020 |  | 10,139,000
2018/2019 |  | 9,189,000
2017/2018 |  | 6,517,000
2016/2017 |  | 3,123,000
Prior |  | 1,118,000
Revolving Loans Amortized Cost Basis |  | 5,261,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 799,000
Total amortized cost basis |  | 39,163,000
Consumer loans | No Score |  |
Credit quality |  |
2020/2021 |  | 339,000
2019/2020 |  | 103,000
2018/2019 |  | 64,000
2017/2018 |  | 109,000
2016/2017 |  | 10,000
Revolving Loans Amortized Cost Basis |  | 33,854,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 356,000
Total amortized cost basis |  | 34,835,000
Consumer loans | Other |  |
Credit quality |  |
2020/2021 |  | 380,000
2019/2020 |  | 1,890,000
2018/2019 |  | 73,000
2017/2018 |  | 2,214,000
2016/2017 |  | 45,000
Prior |  | 6,768,000
Revolving Loans Amortized Cost Basis |  | 69,302,000
Total amortized cost basis |  | 80,672,000
Residential and consumer |  |
Credit quality |  |
2020/2021 | 2,437,751,000 |
2019/2020 | 1,676,792,000 |
2018/2019 | 1,855,543,000 |
2017/2018 | 1,293,534,000 |
2016/2017 | 1,021,072,000 |
Prior | 2,548,236,000 |
Revolving Loans Amortized Cost Basis | 1,964,409,000 |
Revolving Loans Converted to Term Loans Amortized Cost Basis | 37,002,000 |
Total amortized cost basis | 12,834,339,000 |
Residential |  |
Credit quality |  |
2020/2021 | 956,022,000 | 864,559,000
2019/2020 | 779,980,000 | 482,495,000
2018/2019 | 392,872,000 | 389,725,000
2017/2018 | 286,382,000 | 471,962,000
2016/2017 | 362,328,000 | 391,156,000
Prior | 1,136,276,000 | 1,089,580,000
Revolving Loans Amortized Cost Basis | 843,742,000 | 834,099,000
Revolving Loans Converted to Term Loans Amortized Cost Basis | 9,104,000 | 8,266,000
Total amortized cost basis | 4,766,706,000 | 4,531,842,000
Residential | Residential mortgage |  |
Credit quality |  |
Loans and leases | 3,914,632,000 | 3,690,218,000
Home equity Line | Home equity |  |
Credit quality |  |
Loans and leases | 852,074,000 | 841,624,000
Consumer |  |
Credit quality |  |
2020/2021 | 235,737,000 |
2019/2020 | 193,620,000 |
2018/2019 | 210,461,000 |
2017/2018 | 146,255,000 |
2016/2017 | 82,413,000 |
Prior | 33,880,000 |
Revolving Loans Amortized Cost Basis | 331,813,000 |
Revolving Loans Converted to Term Loans Amortized Cost Basis | 4,535,000 |
Total amortized cost basis | 1,238,714,000 |
Consumer | 740 and greater |  |
Credit quality |  |
2020/2021 | 130,773,000 |
2019/2020 | 88,770,000 |
2018/2019 | 88,797,000 |
2017/2018 | 65,818,000 |
2016/2017 | 30,908,000 |
Prior | 11,516,000 |
Revolving Loans Amortized Cost Basis | 107,938,000 |
Revolving Loans Converted to Term Loans Amortized Cost Basis | 245,000 |
Total amortized cost basis | 524,765,000 |
Consumer | 680 - 739 |  |
Credit quality |  |
2020/2021 | 72,447,000 |
2019/2020 | 63,996,000 |
2018/2019 | 65,105,000 |
2017/2018 | 41,209,000 |
2016/2017 | 21,461,000 |
Prior | 8,912,000 |
Revolving Loans Amortized Cost Basis | 68,887,000 |
Revolving Loans Converted to Term Loans Amortized Cost Basis | 717,000 |
Total amortized cost basis | 342,734,000 |
Consumer | 620 - 679 |  |
Credit quality |  |
2020/2021 | 27,131,000 |
2019/2020 | 28,491,000 |
2018/2019 | 33,219,000 |
2017/2018 | 22,225,000 |
2016/2017 | 15,042,000 |
Prior | 6,825,000 |
Revolving Loans Amortized Cost Basis | 30,956,000 |
Revolving Loans Converted to Term Loans Amortized Cost Basis | 1,398,000 |
Total amortized cost basis | 165,287,000 |
Consumer | 550 - 619 |  |
Credit quality |  |
2020/2021 | 3,181,000 |
2019/2020 | 8,735,000 |
2018/2019 | 15,408,000 |
2017/2018 | 12,262,000 |
2016/2017 | 9,546,000 |
Prior | 4,829,000 |
Revolving Loans Amortized Cost Basis | 10,150,000 |
Revolving Loans Converted to Term Loans Amortized Cost Basis | 1,177,000 |
Total amortized cost basis | 65,288,000 |
Consumer | Less than 550 |  |
Credit quality |  |
2020/2021 | 341,000 |
2019/2020 | 3,200,000 |
2018/2019 | 6,116,000 |
2017/2018 | 4,665,000 |
2016/2017 | 3,196,000 |
Prior | 1,757,000 |
Revolving Loans Amortized Cost Basis | 2,983,000 |
Revolving Loans Converted to Term Loans Amortized Cost Basis | 578,000 |
Total amortized cost basis | 22,836,000 |
Consumer | No Score |  |
Credit quality |  |
2020/2021 | 1,155,000 |
2019/2020 | 60,000 |
2018/2019 | 81,000 |
2017/2018 | 46,000 |
2016/2017 | 77,000 |
Prior | 3,000 |
Revolving Loans Amortized Cost Basis | 34,234,000 |
Revolving Loans Converted to Term Loans Amortized Cost Basis | 420,000 |
Total amortized cost basis | 36,076,000 |
Consumer | Other |  |
Credit quality |  |
2020/2021 | 709,000 |
2019/2020 | 368,000 |
2018/2019 | 1,735,000 |
2017/2018 | 30,000 |
2016/2017 | 2,183,000 |
Prior | 38,000 |
Revolving Loans Amortized Cost Basis | 76,665,000 |
Total amortized cost basis | 81,728,000 |
Consumer | Consumer loans |  |
Credit quality |  |
Loans and leases | 1,238,714,000 | 1,353,842,000
Home equity line |  |
Credit quality |  |
Revolving Loans Amortized Cost Basis | 843,117,000 |
Revolving Loans Converted to Term Loans Amortized Cost Basis | 8,957,000 |
Total amortized cost basis | 852,074,000 |
Home equity line | 740 and greater |  |
Credit quality |  |
Revolving Loans Amortized Cost Basis | 637,131,000 |
Revolving Loans Converted to Term Loans Amortized Cost Basis | 2,220,000 |
Total amortized cost basis | 639,351,000 |
Home equity line | 680 - 739 |  |
Credit quality |  |
Revolving Loans Amortized Cost Basis | 150,452,000 |
Revolving Loans Converted to Term Loans Amortized Cost Basis | 3,485,000 |
Total amortized cost basis | 153,937,000 |
Home equity line | 620 - 679 |  |
Credit quality |  |
Revolving Loans Amortized Cost Basis | 38,987,000 |
Revolving Loans Converted to Term Loans Amortized Cost Basis | 1,709,000 |
Total amortized cost basis | 40,696,000 |
Home equity line | 550 - 619 |  |
Credit quality |  |
Revolving Loans Amortized Cost Basis | 10,433,000 |
Revolving Loans Converted to Term Loans Amortized Cost Basis | 1,473,000 |
Total amortized cost basis | 11,906,000 |
Home equity line | Less than 550 |  |
Credit quality |  |
Revolving Loans Amortized Cost Basis | 2,260,000 |
Revolving Loans Converted to Term Loans Amortized Cost Basis | 70,000 |
Total amortized cost basis | 2,330,000 |
Home equity line | No Score |  |
Credit quality |  |
Revolving Loans Amortized Cost Basis | 3,854,000 |
Total amortized cost basis | 3,854,000 |
Commercial and Industrial |  |
Credit quality |  |
2020/2021 | 649,128,000 | 931,522,000
2019/2020 | 186,416,000 | 349,849,000
2018/2019 | 278,951,000 | 215,307,000
2017/2018 | 152,289,000 | 81,113,000
2016/2017 | 35,345,000 | 56,095,000
Prior | 207,644,000 | 111,069,000
Revolving Loans Amortized Cost Basis | 662,248,000 | 1,243,900,000
Revolving Loans Converted to Term Loans Amortized Cost Basis | 23,363,000 | 30,652,000
Total amortized cost basis | 2,195,384,000 | 3,019,507,000
Loans and leases | 2,195,384,000 | 3,019,507,000
Commercial and Industrial | Pass |  |
Credit quality |  |
2020/2021 | 633,079,000 | 873,639,000
2019/2020 | 172,147,000 | 324,030,000
2018/2019 | 162,921,000 | 183,329,000
2017/2018 | 128,968,000 | 73,000,000
2016/2017 | 31,439,000 | 49,886,000
Prior | 194,494,000 | 94,360,000
Revolving Loans Amortized Cost Basis | 578,257,000 | 1,058,786,000
Revolving Loans Converted to Term Loans Amortized Cost Basis | 21,767,000 | 28,853,000
Total amortized cost basis | 1,923,072,000 | 2,685,883,000
Commercial and Industrial | Special mention |  |
Credit quality |  |
2020/2021 | 5,421,000 | 20,937,000
2019/2020 | 4,709,000 | 10,370,000
2018/2019 | 104,973,000 | 20,164,000
2017/2018 | 4,083,000 | 2,099,000
2016/2017 | 1,069,000 | 279,000
Prior | 4,292,000 | 8,316,000
Revolving Loans Amortized Cost Basis | 23,127,000 | 101,183,000
Revolving Loans Converted to Term Loans Amortized Cost Basis | 289,000 | 1,549,000
Total amortized cost basis | 147,963,000 | 164,897,000
Commercial and Industrial | Substandard |  |
Credit quality |  |
2020/2021 | 371,000 | 23,804,000
2019/2020 | 1,663,000 | 2,023,000
2018/2019 | 2,102,000 | 2,568,000
2017/2018 | 13,874,000 | 677,000
2016/2017 | 97,000 | 4,063,000
Prior | 8,285,000 | 8,113,000
Revolving Loans Amortized Cost Basis | 19,162,000 | 33,775,000
Revolving Loans Converted to Term Loans Amortized Cost Basis | 1,307,000 | 250,000
Total amortized cost basis | 46,861,000 | 75,273,000
Commercial and Industrial | Other |  |
Credit quality |  |
2020/2021 | 10,257,000 | 13,142,000
2019/2020 | 7,897,000 | 13,426,000
2018/2019 | 8,955,000 | 9,246,000
2017/2018 | 5,364,000 | 5,337,000
2016/2017 | 2,740,000 | 1,867,000
Prior | 573,000 | 280,000
Revolving Loans Amortized Cost Basis | 41,702,000 | 50,156,000
Total amortized cost basis | 77,488,000 | 93,454,000
Commercial real estate |  |
Credit quality |  |
2020/2021 | 493,286,000 | 344,374,000
2019/2020 | 343,905,000 | 678,824,000
2018/2019 | 626,995,000 | 586,274,000
2017/2018 | 540,084,000 | 484,627,000
2016/2017 | 458,362,000 | 343,882,000
Prior | 1,039,345,000 | 894,258,000
Revolving Loans Amortized Cost Basis | 67,791,000 | 60,114,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 323,000
Total amortized cost basis | 3,569,768,000 | 3,392,676,000
Loans and leases | 3,569,768,000 | 3,392,676,000
Commercial real estate | Pass |  |
Credit quality |  |
2020/2021 | 493,286,000 | 342,845,000
2019/2020 | 342,433,000 | 611,243,000
2018/2019 | 578,079,000 | 541,104,000
2017/2018 | 522,123,000 | 447,366,000
2016/2017 | 429,840,000 | 295,426,000
Prior | 967,286,000 | 814,398,000
Revolving Loans Amortized Cost Basis | 59,685,000 | 47,604,000
Revolving Loans Converted to Term Loans Amortized Cost Basis |  | 323,000
Total amortized cost basis | 3,392,732,000 | 3,100,309,000
Commercial real estate | Special mention |  |
Credit quality |  |
2020/2021 |  | 1,500,000
2019/2020 | 1,472,000 | 63,617,000
2018/2019 | 48,916,000 | 26,187,000
2017/2018 | 16,054,000 | 33,482,000
2016/2017 | 28,264,000 | 37,841,000
Prior | 56,319,000 | 61,279,000
Revolving Loans Amortized Cost Basis | 7,604,000 | 2,999,000
Total amortized cost basis | 158,629,000 | 226,905,000
Commercial real estate | Substandard |  |
Credit quality |  |
2020/2021 |  | 29,000
2019/2020 |  | 3,964,000
2018/2019 |  | 18,983,000
2017/2018 | 1,907,000 | 3,779,000
2016/2017 | 258,000 | 10,615,000
Prior | 15,578,000 | 18,083,000
Revolving Loans Amortized Cost Basis | 502,000 | 9,511,000
Total amortized cost basis | 18,245,000 | 64,964,000
Commercial real estate | Other |  |
Credit quality |  |
Prior | 162,000 | 498,000
Total amortized cost basis | 162,000 | 498,000
Construction |  |
Credit quality |  |
2020/2021 | 76,636,000 | 70,509,000
2019/2020 | 104,880,000 | 250,631,000
2018/2019 | 290,800,000 | 211,831,000
2017/2018 | 157,746,000 | 94,034,000
2016/2017 | 65,741,000 | 25,492,000
Prior | 71,460,000 | 54,353,000
Revolving Loans Amortized Cost Basis | 58,815,000 | 28,969,000
Total amortized cost basis | 826,078,000 | 735,819,000
Loans and leases | 826,078,000 | 735,819,000
Construction | Pass |  |
Credit quality |  |
2020/2021 | 57,368,000 | 53,931,000
2019/2020 | 94,127,000 | 233,730,000
2018/2019 | 285,960,000 | 202,808,000
2017/2018 | 151,714,000 | 83,792,000
2016/2017 | 63,031,000 | 23,171,000
Prior | 67,670,000 | 41,536,000
Revolving Loans Amortized Cost Basis | 58,013,000 | 28,386,000
Total amortized cost basis | 777,883,000 | 667,354,000
Construction | Special mention |  |
Credit quality |  |
2019/2020 |  | 508,000
2018/2019 | 473,000 | 707,000
2017/2018 | 708,000 | 4,717,000
Prior | 359,000 | 9,172,000
Total amortized cost basis | 1,540,000 | 15,104,000
Construction | Substandard |  |
Credit quality |  |
2018/2019 |  | 541,000
2017/2018 | 369,000 | 1,840,000
2016/2017 |  | 521,000
Prior | 850,000 | 989,000
Total amortized cost basis | 1,219,000 | 3,891,000
Construction | Other |  |
Credit quality |  |
2020/2021 | 19,268,000 | 16,578,000
2019/2020 | 10,753,000 | 16,393,000
2018/2019 | 4,367,000 | 7,775,000
2017/2018 | 4,955,000 | 3,685,000
2016/2017 | 2,710,000 | 1,800,000
Prior | 2,581,000 | 2,656,000
Revolving Loans Amortized Cost Basis | 802,000 | 583,000
Total amortized cost basis | 45,436,000 | 49,470,000
Lease financing |  |
Credit quality |  |
2020/2021 | 26,942,000 | 82,722,000
2019/2020 | 67,991,000 | 63,286,000
2018/2019 | 55,464,000 | 14,307,000
2017/2018 | 10,778,000 | 19,648,000
2016/2017 | 16,883,000 | 3,361,000
Prior | 59,631,000 | 62,087,000
Total amortized cost basis | 237,689,000 | 245,411,000
Loans and leases | 237,689,000 | 245,411,000
Lease financing | Pass |  |
Credit quality |  |
2020/2021 | 26,419,000 | 79,064,000
2019/2020 | 64,989,000 | 60,717,000
2018/2019 | 53,457,000 | 13,669,000
2017/2018 | 10,371,000 | 17,207,000
2016/2017 | 15,819,000 | 3,010,000
Prior | 58,940,000 | 61,266,000
Total amortized cost basis | 229,995,000 | 234,933,000
Lease financing | Special mention |  |
Credit quality |  |
2020/2021 | 523,000 | 950,000
2019/2020 | 282,000 | 892,000
2018/2019 | 501,000 | 311,000
2017/2018 | 182,000 | 1,300,000
2016/2017 | 27,000 | 351,000
Prior | 201,000 | 295,000
Total amortized cost basis | 1,716,000 | 4,099,000
Lease financing | Substandard |  |
Credit quality |  |
2020/2021 |  | 2,708,000
2019/2020 | 2,720,000 | 1,677,000
2018/2019 | 1,506,000 | 327,000
2017/2018 | 225,000 | 1,141,000
2016/2017 | 1,037,000 |
Prior | 490,000 | 526,000
Total amortized cost basis | 5,978,000 | 6,379,000
Commercial Lending |  |
Credit quality |  |
2020/2021 | 1,245,992,000 | 1,429,127,000
2019/2020 | 703,192,000 | 1,342,590,000
2018/2019 | 1,252,210,000 | 1,027,719,000
2017/2018 | 860,897,000 | 679,422,000
2016/2017 | 576,331,000 | 428,830,000
Prior | 1,378,080,000 | 1,121,767,000
Revolving Loans Amortized Cost Basis | 788,854,000 | 1,332,983,000
Revolving Loans Converted to Term Loans Amortized Cost Basis | 23,363,000 | 30,975,000
Total amortized cost basis | $ 6,828,919,000 | $ 7,393,413,000

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