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Summary of Significant Accounting Policies Significant Accounting Policies (Narrative) (Details) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) Locations | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Accounting Policies [Abstract] |  |  |  |  |
Locations | Locations | 300 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained Earnings | $ 3,399,972 |  | $ 3,138,472 | $ 2,937,149 | $ 2,718,184
Allowance for Credit Loss | 220,834 | $ 139,643 |  |  |
Off-Balance Sheet, Credit Loss, Liability | 38,307 | 17,165 | 1,075 |  |
Restricted Cash and Cash Equivalents | 23,400 |  | 20,300 |  |
Cash Held at Federal Reserve Bank | $ 1,700,000 |  |  |  |
Amortization period of annual fees on credit card loans, months | 12 months |  |  |  |
Consumer Loans Charged Down to Fair Value [Line Items] |  |  |  |  |
Delinquency Period Revolving Home Equity Loans Charged Down to Fair Value | 180 days |  |  |  |
Period past due credit card loans are charged off, days | 180 days |  |  |  |
Period past due loans are placed on non-accrual, days | 90 days |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Common stock dividend rate percentage | 5.00% |  |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for Credit Loss | $ 121,549 | 62,049 |  |  |
Off-Balance Sheet, Credit Loss, Liability | 37,259 | 16,456 |  |  |
Personal Banking Portfolio Segment [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for Credit Loss | 99,285 | 77,594 |  |  |
Off-Balance Sheet, Credit Loss, Liability | 1,048 | 709 |  |  |
Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained Earnings | $ 73,000 |  | $ 201,562 | $ 241,163 | $ 221,374
Minimum [Member] |  |  |  |  |
Consumer Loans Charged Down to Fair Value [Line Items] |  |  |  |  |
Consumer loans charged down to fair value, days delinquent | 120 days |  |  |  |
Maximum [Member] |  |  |  |  |
Consumer Loans Charged Down to Fair Value [Line Items] |  |  |  |  |
Consumer loans charged down to fair value, days delinquent | 180 days |  |  |  |
Buildings [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciable lives for asset, years | 30 years |  |  |  |
Building Improvements [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciable lives for asset, years | 10 years |  |  |  |
Equipment [Member] | Minimum [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciable lives for asset, years | 3 years |  |  |  |
Equipment [Member] | Maximum [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciable lives for asset, years | 10 years |  |  |  |
Leasehold Improvements [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciable lives for asset, years | 10 years |  |  |  |
Core Deposits [Member] | Minimum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 8 years |  |  |  |
Core Deposits [Member] | Maximum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 14 years |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for Credit Loss |  | (21,039) |  |  |
Off-Balance Sheet, Credit Loss, Liability |  | 16,090 |  |  |
Deferred Income Tax Assets, Net |  | (1,200) |  |  |
Accounting Standards Update 2016-13 | Commercial Portfolio Segment [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for Credit Loss |  | (29,711) |  |  |
Accounting Standards Update 2016-13 | Personal Banking Portfolio Segment [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for Credit Loss |  | 8,672 |  |  |
Accounting Standards Update 2016-13 | Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained Earnings |  | $ 3,800 |  |  |

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