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Revenue from Contract with Customer (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Personal trust and agency accounts income | $ 8,761 | $ 9,001 | $ 8,495
Employee benefit and retirement-related accounts income | 7,921 | 7,178 | 6,863
Investment management and investment advisory agency accounts income | 10,652 | 10,024 | 9,352
Other income from fiduciary activities | 1,539 | 1,565 | 1,583
Non-sufficient funds (NSF) fees | 4,999 | 7,073 | 7,483
Demand deposit account (DDA) charges | 2,920 | 3,105 | 3,310
Other service charges on deposit accounts | 526 | 657 | 668
Credit card other service income | 2,112 | 2,361 | 2,239
HELOC other service income | 424 | 407 | 471
Installment other service income | 165 | 173 | 243
Real estate other service income | 32,889 | 11,158 | 9,079
Commercial other service income | 2,021 | 1,401 | 2,234
Debit card fee income | 22,160 | 20,250 | 17,317
Bank Owned Life Insurance Income | 4,789 | 4,557 | 6,815
ATM Fees | 1,773 | 1,828 | 1,978
Gains (Losses) on Sales of Other Real Estate | 1,207 | (222) | 4,235
Debt and Equity Securities, Gain (Loss) | 3,286 | (421) | (2,271)
Gain on equity securities, net | 2,182 | 5,118 | 4,616
Other components of net periodic benefit income | 7,952 | 4,732 | 6,820
Gain (Loss) on Sales of Loans, Net | 0 | 0 | 2,826
Noninterest Income, Other | 7,386 | 7,248 | 6,745
Noninterest Income | 125,664 | 97,193 | 101,101
Bank Servicing [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest Income, Other | 37,600 | 15,500 | 14,300
Within Scope [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest Income, Other | 5,200 | 4,900 | 5,500
Out of Scope [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest Income, Other | 32,400 | 10,600 | 8,800
Pnb Segment [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Personal trust and agency accounts income | 8,761 | 9,001 | 8,495
Employee benefit and retirement-related accounts income | 7,921 | 7,178 | 6,863
Investment management and investment advisory agency accounts income | 10,652 | 10,024 | 9,352
Other income from fiduciary activities | 1,539 | 1,565 | 1,583
Non-sufficient funds (NSF) fees | 4,999 | 7,073 | 7,483
Demand deposit account (DDA) charges | 2,920 | 3,105 | 3,310
Other service charges on deposit accounts | 526 | 657 | 668
Credit card other service income | 2,108 | 2,354 | 2,212
HELOC other service income | 424 | 403 | 471
Installment other service income | 165 | 256 | 243
Real estate other service income | 32,827 | 11,167 | 9,079
Commercial other service income | 1,493 | 1,259 | 1,153
Debit card fee income | 22,160 | 20,250 | 17,317
Bank Owned Life Insurance Income | 4,521 | 4,168 | 4,903
ATM Fees | 1,773 | 1,828 | 1,978
Gains (Losses) on Sales of Other Real Estate | 836 | (110) | 1,440
Debt and Equity Securities, Gain (Loss) | 3,286 | (421) | (2,271)
Gain on equity securities, net | 2,429 | 913 | 549
Other components of net periodic benefit income | 7,759 | 4,587 | 6,609
Gain (Loss) on Sales of Loans, Net |  |  | 660
Noninterest Income, Other | 7,132 | 7,135 | 6,884
Noninterest Income | 124,231 | 92,392 | 88,981
GFSC [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Personal trust and agency accounts income | 0 | 0 | 0
Employee benefit and retirement-related accounts income | 0 | 0 | 0
Investment management and investment advisory agency accounts income | 0 | 0 | 0
Other income from fiduciary activities | 0 | 0 | 0
Non-sufficient funds (NSF) fees | 0 | 0 | 0
Demand deposit account (DDA) charges | 0 | 0 | 0
Other service charges on deposit accounts | 0 | 0 | 0
Credit card other service income | 4 | 7 | 27
HELOC other service income | 0 | 0 | 0
Installment other service income | 0 | 0 | 0
Real estate other service income | 0 | 0 | 0
Commercial other service income | 0 | 0 | 0
Debit card fee income | 0 | 0 | 0
Bank Owned Life Insurance Income | 0 | 0 | 0
ATM Fees | 0 | 0 | 0
Gains (Losses) on Sales of Other Real Estate | 0 | 0 | 0
Debt and Equity Securities, Gain (Loss) | 0 | 0 | 0
Gain on equity securities, net | 0 | 0 | 0
Other components of net periodic benefit income | 94 | 54 | 75
Gain (Loss) on Sales of Loans, Net |  |  | 0
Noninterest Income, Other | 157 | 109 | 85
Noninterest Income | 255 | 170 | 187
Other Segments [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Personal trust and agency accounts income | 0 | 0 | 0
Employee benefit and retirement-related accounts income | 0 | 0 | 0
Investment management and investment advisory agency accounts income | 0 | 0 | 0
Other income from fiduciary activities | 0 | 0 | 0
Non-sufficient funds (NSF) fees | 0 | 0 | 0
Demand deposit account (DDA) charges | 0 | 0 | 0
Other service charges on deposit accounts | 0 | 0 | 0
Credit card other service income | 0 | 0 | 0
HELOC other service income | 0 | 4 | 0
Installment other service income | 0 | (83) | 0
Real estate other service income | 62 | (9) | 0
Commercial other service income | 528 | 142 | 1,081
Debit card fee income | 0 | 0 | 0
Bank Owned Life Insurance Income | 268 | 389 | 1,912
ATM Fees | 0 | 0 | 0
Gains (Losses) on Sales of Other Real Estate | 371 | (112) | 2,795
Debt and Equity Securities, Gain (Loss) | 0 | 0 | 0
Gain on equity securities, net | (247) | 4,205 | 4,067
Other components of net periodic benefit income | 99 | 91 | 136
Gain (Loss) on Sales of Loans, Net |  |  | 2,166
Noninterest Income, Other | 97 | 4 | (224)
Noninterest Income | $ 1,178 | $ 4,631 | $ 11,933

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