Fair Value - Reconciliation of All Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Pooled trust preferred securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 8,210	$ 7,422	$ 7,913	$ 8,222
Accretion of discount	5	3	10	7
Sales/payments received	(12)	(16)	(27)	(33)
Increase (decrease) in fair value of securities	1,185	(224)	1,492	(1,011)
Balance at end of period	9,388	7,185	9,388	7,185
States and political subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	0	0	0	40
Accretion of discount	0	0	0	0
Sales/payments received	0	0	0	(40)
Increase (decrease) in fair value of securities	0	0	0	0
Balance at end of period	$ 0	$ 0	$ 0	$ 0