Outstanding Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Commitments to extend credit
Credit Commitments and Contingencies
Financial instruments whose contract amounts represent credit risk	$ 1,600,624	$ 1,398,483
Standby letters of credit
Credit Commitments and Contingencies
Financial instruments whose contract amounts represent credit risk	$ 35,334	$ 32,156

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