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Income Taxes Income Tax Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate [Line Items]
Statutory U.S. Federal Tax Rate									21.00%	35.00%
Expected income taxes									$ 13,286	$ 10,186	$ 14,604
Tax-exempt income from bank owned life insurance									563	283	573
Other tax exempt income									(1,701)	(1,598)	(2,223)
Nondeductible interest expense									70	43	28
State taxes, net of federal taxes									4,280	3,354	2,062
Other items									116	218	(266)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount									0	0	1,410
Effect of marginal tax rate									(165)	(15)	0
Total	$ 3,543	$ 3,820	$ 3,642	$ 4,318	$ 3,206	$ 2,731	$ 3,105	$ 2,863	$ 15,323	$ 11,905	$ 15,042

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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