Deposits - Maturity Distribution of Time Certificates of Deposits (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Maturity distribution of time certificates of deposit
Three months or less	$ 448,753
Over three through six months	316,676
Over six through twelve months	741,450
One to two years	191,618
Two to three years	99,128
Three to four years	38,116
Four to five years	67,206
Thereafter	716
Total	1,903,663
Under $250,000
Maturity distribution of time certificates of deposit
Three months or less	171,763
Over three through six months	169,882
Over six through twelve months	409,825
One to two years	109,209
Two to three years	84,594
Three to four years	33,388
Four to five years	45,581
Thereafter	466
Total	1,024,708
$250,000 or More
Maturity distribution of time certificates of deposit
Three months or less	276,990
Over three through six months	146,794
Over six through twelve months	331,625
One to two years	82,409
Two to three years	14,534
Three to four years	4,728
Four to five years	21,625
Thereafter	250
Total	$ 878,955