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Fair Value Measurements (Estimated Fair Values of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financial assets, Estimated Fair Value |  |
Investment securities held to maturity | $ 247,835 | $ 65,828
Fair Value, Inputs, Level 1 [Member] | Carrying Amount [Member] |  |
Financial assets, Estimated Fair Value |  |
Cash and cash equivalents | 310,852 | 186,917
Fair Value, Inputs, Level 1 [Member] | Estimated Fair Value [Member] |  |
Financial assets, Estimated Fair Value |  |
Cash and cash equivalents | 310,852 | 186,917
Fair Value, Inputs, Level 2 [Member] | Carrying Amount [Member] |  |
Financial assets, Estimated Fair Value |  |
Investment securities held to maturity | 250,501 | 65,706
Restricted securities | 3,189 | 3,626
Cash surrender value on life insurance | 41,949 | 31,018
Financial liabilities, Estimated Fair Value |  |
Noninterest-bearing demand | 554,902 | 509,091
Checking plus interest | 515,796 | 446,243
Money market | 443,270 | 292,974
Savings | 220,346 | 177,524
Club | 1,490 | 392
Certificates of deposit, $100,000 or more | 140,390 | 129,623
Other time | 141,871 | 144,858
Securities sold under retail repurchase agreement | 3,501 | 1,050
Subordinated debt | 24,521 | 24,429
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value [Member] |  |
Financial assets, Estimated Fair Value |  |
Investment securities held to maturity | 247,835 | 65,828
Restricted securities | 3,189 | 3,626
Cash surrender value on life insurance | 41,949 | 31,018
Financial liabilities, Estimated Fair Value |  |
Noninterest-bearing demand | 554,902 | 509,091
Checking plus interest | 515,796 | 446,243
Money market | 443,270 | 292,974
Savings | 220,346 | 177,524
Club | 1,490 | 392
Certificates of deposit, $100,000 or more | 141,610 | 131,271
Other time | 142,450 | 146,137
Securities sold under retail repurchase agreement | 3,501 | 1,050
Subordinated debt | 26,903 | 25,745
Fair Value, Inputs, Level 3 [Member] | Carrying Amount [Member] |  |
Financial assets, Estimated Fair Value |  |
Loans, net | 1,479,372 | 1,440,368
Fair Value, Inputs, Level 3 [Member] | Estimated Fair Value [Member] |  |
Financial assets, Estimated Fair Value |  |
Loans, net | $ 1,475,793 | $ 1,436,292

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