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Fair Value Measurements - Estimated fair value of company's financial instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Federal funds sold | $ 28,200 | $ 38,987
Interest bearing deposits with other banks | 1,752,420 | 195,447
Estimated Fair Value | 1,150,885 | 843,165
Bank owned life insurance | 76,729 | 75,724
Liabilities |  |
Interest bearing deposits | 756,923 | 863,856
Customer repurchase agreements | 26,726 | 30,980
Fair Value, Inputs, Level 1 |  |
Assets |  |
Cash and due from banks | 8,435 | 7,539
Fair Value, Inputs, Level 2 |  |
Assets |  |
Cash and due from banks | 0 | 0
Federal funds sold | 28,200 | 38,987
Interest bearing deposits with other banks | 1,752,420 | 195,447
Estimated Fair Value | 1,149,385 | 832,432
Federal Reserve and Federal Home Loan Bank stock | 40,104 | 35,194
Fair Value | 88,205 | 56,707
Bank owned life insurance | 76,729 | 75,724
Annuity investment | 14,468 | 14,697
Liabilities |  |
Noninterest bearing deposits | 2,809,334 | 2,064,367
Interest bearing deposits | 756,923 | 3,876,985
Time deposits | 993,500 | 1,291,688
Customer repurchase agreements | 26,726 | 30,980
Borrowings | 575,435 | 328,330
Fair Value, Inputs, Level 2 | Interest Rate Swap |  |
Liabilities |  |
Derivative liability | 516 | 203
Fair Value, Inputs, Level 2 | Credit Risk Contract |  |
Liabilities |  |
Derivative liability | 118 | 86
Fair Value, Inputs, Level 2 | Interest Rate Caps |  |
Assets |  |
Derivative asset | 3,413 |
Liabilities |  |
Derivative liability | 3,574 | 312
Fair Value, Inputs, Level 2 | Mortgage Banking Derivative |  |
Assets |  |
Derivative asset | 0 | 280
Liabilities |  |
Derivative liability |  | 0
Fair Value, Inputs, Level 3 |  |
Assets |  |
Estimated Fair Value | 1,500 | 10,931
Loans | 7,608,687 | 7,550,249
Fair Value, Inputs, Level 3 | Mortgage Banking Derivative |  |
Assets |  |
Derivative asset | 5,213 |
Liabilities |  |
Derivative liability |  | 66
Carrying Value |  |
Assets |  |
Cash and due from banks | 8,435 | 7,539
Federal funds sold | 28,200 | 38,987
Interest bearing deposits with other banks | 1,752,420 | 195,447
Estimated Fair Value | 1,150,885 | 843,363
Federal Reserve and Federal Home Loan Bank stock | 40,104 | 35,194
Fair Value | 88,205 | 56,707
Loans | 7,650,633 | 7,472,090
Bank owned life insurance | 76,729 | 75,724
Annuity investment | 14,468 | 14,697
Liabilities |  |
Noninterest bearing deposits | 2,809,334 | 2,064,367
Interest bearing deposits | 756,923 | 3,876,985
Time deposits | 977,760 | 1,283,039
Customer repurchase agreements | 26,726 | 30,980
Borrowings | 568,077 | 467,687
Carrying Value | Interest Rate Swap |  |
Liabilities |  |
Derivative liability | 516 | 203
Carrying Value | Credit Risk Contract |  |
Liabilities |  |
Derivative liability | 118 | 86
Carrying Value | Interest Rate Caps |  |
Assets |  |
Derivative asset | 3,413 |
Liabilities |  |
Derivative liability | 3,574 | 312
Carrying Value | Mortgage Banking Derivative |  |
Assets |  |
Derivative asset | 5,213 | 280
Liabilities |  |
Derivative liability |  | 66
Fair Value |  |
Assets |  |
Cash and due from banks | 8,435 | 7,539
Federal funds sold | 28,200 | 38,987
Interest bearing deposits with other banks | 1,752,420 | 195,447
Estimated Fair Value | 1,150,885 | 843,363
Federal Reserve and Federal Home Loan Bank stock | 40,104 | 35,194
Fair Value | 88,205 | 56,707
Loans | 7,608,687 | 7,550,249
Bank owned life insurance | 76,729 | 75,724
Annuity investment | 14,468 | 14,697
Liabilities |  |
Noninterest bearing deposits | 2,809,334 | 2,064,367
Interest bearing deposits | 756,923 | 3,876,985
Time deposits | 993,500 | 1,291,688
Customer repurchase agreements | 26,726 | 30,980
Borrowings | 575,435 | 328,330
Fair Value | Interest Rate Swap |  |
Liabilities |  |
Derivative liability | 516 | 203
Fair Value | Credit Risk Contract |  |
Liabilities |  |
Derivative liability | 118 | 86
Fair Value | Interest Rate Caps |  |
Assets |  |
Derivative asset | 3,413 |
Liabilities |  |
Derivative liability | 3,574 | 312
Fair Value | Mortgage Banking Derivative |  |
Assets |  |
Derivative asset | $ 5,213 | 280
Liabilities |  |
Derivative liability |  | $ 66

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