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Fair Value Measurements - Assets and liabilities recorded at fair value on recurring basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | $ 1,150,885 | $ 843,165
Assets measured at a fair value | 1,247,716 |
Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 88,205 | 56,707
Assets measured at a fair value |  | 900,469
Derivative liability |  | 86
Liabilities measured at a fair value | 4,208 | 667
Derivative Financial Instruments, Liability | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability | 118 |
Interest Rate Caps | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 3,413 | 317
Derivative liability | 3,574 | 312
Interest Rate Swap | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability | 516 | 203
U. S. agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 181,921 | 179,794
U. S. agency securities | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 181,921 | 179,794
Residential mortgage backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 825,001 | 543,852
Fair Value | 88,205 | 56,707
Residential mortgage backed securities | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 825,001 | 543,852
Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 108,113 | 73,931
Municipal bonds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 108,113 | 73,931
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 35,850 | 10,733
Corporate bonds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 35,850 | 10,733
U.S. Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value |  | 34,855
U.S. Treasury | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value |  | 34,855
Mortgage Banking Derivative | Recurring | Derivative Financial Instruments, Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 5,213 | 280
Mortgage Banking Derivative | Derivative Financial Instruments, Liability | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability |  | 66
Fair Value, Inputs, Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Assets measured at a fair value | 0 | 0
Derivative liability |  | 0
Liabilities measured at a fair value | 0 | 0
Fair Value, Inputs, Level 1 | Derivative Financial Instruments, Liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability | 0 |
Fair Value, Inputs, Level 1 | Interest Rate Caps | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 0
Derivative liability | 0 | 0
Fair Value, Inputs, Level 1 | Interest Rate Swap | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability | 0 | 0
Fair Value, Inputs, Level 1 | U. S. agency securities | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Inputs, Level 1 | Residential mortgage backed securities | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Inputs, Level 1 | Municipal bonds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Inputs, Level 1 | Corporate bonds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Inputs, Level 1 | U.S. Treasury | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value |  | 0
Fair Value, Inputs, Level 1 | Mortgage Banking Derivative | Recurring | Derivative Financial Instruments, Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 0
Fair Value, Inputs, Level 1 | Mortgage Banking Derivative | Derivative Financial Instruments, Liability | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability |  | 0
Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 1,149,385 | 832,432
Fair Value | 88,205 | 56,707
Fair Value, Inputs, Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 88,205 | 56,707
Assets measured at a fair value | 1,241,003 | 889,456
Derivative liability |  | 86
Liabilities measured at a fair value | 4,208 | 601
Fair Value, Inputs, Level 2 | Derivative Financial Instruments, Liability | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability | 118 |
Fair Value, Inputs, Level 2 | Interest Rate Caps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 3,413 |
Derivative liability | 3,574 | 312
Fair Value, Inputs, Level 2 | Interest Rate Caps | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 3,413 | 317
Derivative liability | 3,574 | 312
Fair Value, Inputs, Level 2 | Interest Rate Swap |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability | 516 | 203
Fair Value, Inputs, Level 2 | Interest Rate Swap | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability | 516 | 203
Fair Value, Inputs, Level 2 | U. S. agency securities | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 181,921 | 179,794
Fair Value, Inputs, Level 2 | Residential mortgage backed securities | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 825,001 | 543,852
Fair Value, Inputs, Level 2 | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value |  | 0
Fair Value, Inputs, Level 2 | Municipal bonds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 108,113 | 73,931
Fair Value, Inputs, Level 2 | Corporate bonds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 34,350 |
Fair Value, Inputs, Level 2 | U.S. Treasury | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value |  | 34,855
Fair Value, Inputs, Level 2 | Mortgage Banking Derivative | Recurring | Derivative Financial Instruments, Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 0
Fair Value, Inputs, Level 2 | Mortgage Banking Derivative | Derivative Financial Instruments, Liability | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability |  | 0
Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 1,500 | 10,931
Fair Value, Inputs, Level 3 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets measured at a fair value | 6,713 | 11,013
Liabilities measured at a fair value | 0 | 66
Fair Value, Inputs, Level 3 | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value |  | 0
Fair Value, Inputs, Level 3 | Corporate bonds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | 1,500 | 10,733
Fair Value, Inputs, Level 3 | Mortgage Banking Derivative | Recurring | Derivative Financial Instruments, Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | $ 5,213 | 280
Fair Value, Inputs, Level 3 | Mortgage Banking Derivative | Derivative Financial Instruments, Liability | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability |  | $ 66

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