Borrowings - Borrowings by contractual maturities (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Debt Disclosure
2020	$ 312,233
2021	112,693
2022	103,148
2023	318,884
2024	28,373
Later years	461,566
Total borrowings	1,336,897
Assets Sold Under Agreements To Repurchase
Debt Disclosure
2020	116,113
2021	62,653
2022	0
2023	0
2024	0
Later years	0
Total borrowings	178,766
Other Short Term Borrowings
Debt Disclosure
2020	100,000
2021	0
2022	0
2023	0
2024	0
Later years	0
Total borrowings	100,000
Notes Payable
Debt Disclosure
2020	96,120
2021	50,040
2022	103,148
2023	318,884
2024	28,373
Later years	461,566
Total borrowings	$ 1,058,131