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Fair Value - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | $ 6,399 | $ 3,574
Mortgage servicing rights | 1,200 | 7,300
Other loans, net (3) | 5,570,136 | 5,247,021
Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 6,399 | 3,574
Other loans, net (3) | 5,570,136 | 5,247,021
Nonrecurring basis |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 6,399 | 3,574
Mortgage servicing rights | 1,169 | 7,316
Other loans, net (3) | 3,674 | 6,520
Nonrecurring basis | Level 1 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net (3) | 0 | 0
Nonrecurring basis | Level 2 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Mortgage servicing rights | 1,169 | 7,316
Other loans, net (3) | 0 | 0
Nonrecurring basis | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 6,399 | 3,574
Other loans, net (3) | 3,674 | 6,520
Nonrecurring basis | Commercial real estate |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 4,059 | 2,735
Other loans, net (3) | 2,295 | 2,295
Nonrecurring basis | Commercial real estate | Level 1 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net (3) | 0 | 0
Nonrecurring basis | Commercial real estate | Level 2 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net (3) | 0 | 0
Nonrecurring basis | Commercial real estate | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 4,059 | 2,735
Other loans, net (3) | 2,295 | 2,295
Nonrecurring basis | Construction real estate |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net (3) | 729 | 3,204
Nonrecurring basis | Construction real estate | Level 1 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net (3) | 0 | 0
Nonrecurring basis | Construction real estate | Level 2 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net (3) | 0 | 0
Nonrecurring basis | Construction real estate | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net (3) | 729 | 3,204
Nonrecurring basis | Commercial |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 1,635 | 127
Nonrecurring basis | Commercial | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 1,635 | 127
Nonrecurring basis | Residential real estate |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 705 | 712
Other loans, net (3) | 650 | 1,021
Nonrecurring basis | Residential real estate | Level 1 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net (3) | 0 | 0
Nonrecurring basis | Residential real estate | Level 2 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net (3) | 0 | 0
Nonrecurring basis | Residential real estate | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 705 | 712
Other loans, net (3) | 650 | $ 1,021
Other Assets [Member] | Nonrecurring basis |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net (3) | 3,464 |
Other Assets [Member] | Nonrecurring basis | Level 1 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net (3) | 0 |
Other Assets [Member] | Nonrecurring basis | Level 2 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net (3) | 0 |
Other Assets [Member] | Nonrecurring basis | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net (3) | $ 3,464 |

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