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Derivative Activities - Offsetting of Derivative Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Derivatives not subject to master netting arrangements    
Gross amounts of recognized assets $ 92,880 $ 77,277
Derivatives subject to master netting arrangements:    
Gross amounts of recognized assets 92,402 46,039
Gross amounts offset in the consolidated balance sheet (64,129) (26,969)
Net amounts of assets presented in the consolidated balance sheet 28,273 19,070
Total    
Gross amounts of recognized assets 185,282 123,316
Net amounts of assets presented in the balance sheet 121,153 96,347
Interest rate lock commitments    
Derivatives not subject to master netting arrangements    
Gross amounts of recognized assets 68,248 50,507
Total    
Net amounts of assets presented in the balance sheet 68,248 50,507
Repurchase agreement derivatives    
Derivatives not subject to master netting arrangements    
Gross amounts of recognized assets 24,632 26,770
MBS put options    
Derivatives subject to master netting arrangements:    
Gross amounts of recognized assets 6,287 720
Net amounts of assets presented in the consolidated balance sheet 6,287 720
Total    
Gross amounts of recognized assets 6,287 720
MBS call options    
Derivatives subject to master netting arrangements:    
Gross amounts of recognized assets 6,251 2,135
Net amounts of assets presented in the consolidated balance sheet 6,251 2,135
Total    
Gross amounts of recognized assets 6,251 2,135
Forward contracts | Purchases    
Derivatives subject to master netting arrangements:    
Gross amounts of recognized assets 61,932 35,916
Net amounts of assets presented in the consolidated balance sheet 61,932 35,916
Total    
Gross amounts of recognized assets 61,932 35,916
Forward contracts | Sales    
Derivatives subject to master netting arrangements:    
Gross amounts of recognized assets 1,215 437
Net amounts of assets presented in the consolidated balance sheet 1,215 437
Total    
Gross amounts of recognized assets 1,215 437
Put options on interest rate futures | Purchases    
Derivatives subject to master netting arrangements:    
Gross amounts of recognized assets 2,639 866
Net amounts of assets presented in the consolidated balance sheet 2,639 866
Total    
Gross amounts of recognized assets 2,639 866
Call options on interest rate futures | Purchases    
Derivatives subject to master netting arrangements:    
Gross amounts of recognized assets 14,078 5,965
Net amounts of assets presented in the consolidated balance sheet 14,078 5,965
Total    
Gross amounts of recognized assets 14,078 5,965
Margin Deposits    
Total    
Gross amounts of recognized assets $ 50,652 $ 1,887