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Investment Securities (Contractual Maturities and Estimated Fair Values) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost, Rolling Maturity [Abstract] |  |  |
Due in one year or less, held-to-maturity debt securities amortized cost | $ 1,200,000 |  |
Due after one year through five years, held-to-maturity debt securities amortized cost | 2,200,000 |  |
Amortized cost, held-to-maturity debt securities | 3,400,000 | $ 2,400,000 |
Debt Securities, Held-to-maturity, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |
Due in one year or less, held-to-maturity debt securities, Estimated fair value | 1,200,000 |  |
Due after one year through five years, held-to-maturity debt securities, Estimated fair value | 2,200,000 |  |
Estimated fair value | 3,400,000 | 2,400,000 |
Available-for-sale debt securities amortized cost disclosures |  |  |
Due after five years through ten years, available-for-sale debt securities amortized cost | 355,000 |  |
Due after ten years, available-for-sale debt securities amortized cost | 47,342,000 |  |
Residential mortgage-backed securities, amortized cost | 3,006,592,000 |  |
Amortized cost, Available-for-sale securities | 3,054,289,000 | 3,376,070,000 |
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value | 356,000 |  |
Due after ten years, available-for-sale debt securities, Estimated Fair Value | 50,458,000 |  |
Residential mortgage-backed securities, Estimated Fair Value | 3,029,954,000 |  |
Estimated fair value, Available for sale securities | 3,080,768,000 | 3,378,923,000 |
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |
Proceeds from sales and calls of available for sale securities | 42,350,000 | 94,585,000 | $ 38,175,000
Proceeds from sales and calls of available for sale securities | 42,350,000 | 94,585,000 | 59,782,000
Proceeds from sales of mortgage-backed securities | 0 | 0 | 0
Gross gains realized on sales | 1,000 | 3,000 | 3,000
Gross losses realized on sales | 6,000 | $ 15,000 | $ 144,000
Collateral Pledged |  |  |
Available-for-sale debt securities amortized cost disclosures |  |  |
Amortized cost, Available-for-sale securities | 1,220,400,000 |  |
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |
Fair value of available for sale investment securities pledged | $ 1,224,268,000 |  |

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after rolling tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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- Definition Amortized cost of investment in debt security, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in rolling sixth through tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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