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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) division operating_segment reporting_unit numberOfComponents quarter | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Number of bank divisions | division | 16 |  |  |
Number of operating segments | operating_segment | 1 |  |  |
Maximum period of original maturity to be included in cash and cash equivalents | three months |  |  |
Federal reserve balance or cash on hand required | $ 0 |  |  |
Minimum period past due to consider loans as delinquent | 30 days |  |  |
Minimum period past due to consider loans as non accrual | 90 days |  |  |
Financing receivable, allowance for credit losses, forecasting period | quarter | 4 |  |  |
Financing receivable, allowance for credit losses, number of components | numberOfComponents | 2 |  |  |
Provision for credit losses on loan portfolio | $ 37,637,000 | $ 57,000 | $ 9,953,000 |
Provision for credit losses on off-balance sheet credit exposures | $ 2,128,000 |  |  |
Maximum term leases will be considered short-term | 12 months |  |  |
Maximum period up to which purchase price of business is allocated to assets acquired and liabilities assumed | 1 year |  |  |
Number of reporting units subsequent to aggregation for goodwill assessment | reporting_unit | 1 |  |  |
Revenue from contracts with customers | $ 54,520,000 | 69,877,000 | 76,664,000 |
Impairment losses on receivables related to contracts with customers | $ 0 | 0 |  |
Percentage of likelihood for term more likely than not as it relates to income taxes | 50.00% |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |
Adjustment to retained earnings due to adoption of amendments | $ (2,307,041,000) | (1,960,733,000) | (1,515,854,000) | $ (1,199,057,000)
Allowance for credit losses on loans | 158,243,000 | 124,490,000 | 131,239,000 | 129,568,000
Deferred tax asset | 0 | 2,037,000 |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Adjustment to retained earnings due to adoption of amendments |  | 12,347,000 | 25,114,000 |
Accounting Standards Update 2016-13 |  |  |  |
Allowance for credit losses on loans |  | 3,720,000 |  |
ACL on off-balance sheet, credit exposures |  | 12,817,000 |  |
Deferred tax asset |  | 4,190,000 |  |
Retained Earnings |  |  |  |
Adjustment to retained earnings due to adoption of amendments | $ (667,944,000) | (541,050,000) | (473,183,000) | $ (402,259,000)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Adjustment to retained earnings due to adoption of amendments |  | $ 12,347,000 | $ 25,114,000 |
Minimum Range |  |  |  |
Period past due to consider loan as purchased credit-deteriorated loan | 90 days |  |  |
Minimum number of days delinquent to charge off loans | 120 days |  |  |
Number of years for home equity loan origination term | 10 |  |  |
Period past due to consider loans as delinquent | 30 days |  |  |
Period past due to consider loans as non accrual | 90 days |  |  |
Minimum Range | Office Buildings |  |  |  |
Useful life of premises and equipment | 15 years |  |  |
Minimum Range | Furniture, Fixtures and Equipment |  |  |  |
Useful life of premises and equipment | 3 years |  |  |
Maximum Range |  |  |  |
Number of years for home equity loan origination term | 15 years |  |  |
Period past due to consider loans as delinquent | 89 days |  |  |
Maximum Range | Office Buildings |  |  |  |
Useful life of premises and equipment | 40 years |  |  |
Maximum Range | Furniture, Fixtures and Equipment |  |  |  |
Useful life of premises and equipment | 10 years |  |  |

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